public void TimerSystemOn()
{
    if (timerIsRunning)
    {
        if (timeRemaining > 0)
        {
            timeRemaining -= Time.deltaTime;
            DisplayTime(timeRemaining);
        }
        else
        {
            if (timeRemaining <= 0)
            {
                Debug.Log("Time has run out!");
                timeRemaining = 0;
                timerIsRunning = false;

                if (!timerIsRunning)
                {
                    TimeOut();
                }
            }
        }
    }

    if (!timerIsRunning)
    {
        ReachFinishLine();
        DisplayTime(timeRemaining);

    }
}

void DisplayTime(float timeToDisplay)
{
    timeToDisplay += 1;

    float minutes = Mathf.FloorToInt(timeToDisplay / 60);
    float seconds = Mathf.FloorToInt(timeToDisplay % 60);

    PlayerPrefs.SetFloat("Minutes", minutes);
    PlayerPrefs.SetFloat("Seconds", seconds);
    timeText.text = string.Format("{0:00}:{1:00}", minutes, seconds);

    float highscoreMins = PlayerPrefs.GetInt("Minutes");
    float highscoreSec = PlayerPrefs.GetInt("Seconds");

    if (minutes > highscoreMins || seconds > highscoreSec)
    {
        PlayerPrefs.SetFloat("Minutes", minutes);
        PlayerPrefs.SetFloat("Seconds", seconds);
    }
    Debug.Log("HighscoreSec : " + highscoreSec);
}

 public void TimerSystemOn()
{
    if (timerIsRunning)
    {
        if (timeRemaining > 0)
        {
            timeRemaining -= Time.deltaTime;
            DisplayTime(timeRemaining);
        }
        else
        {
            if (timeRemaining <= 0)
            {
                Debug.Log("Time has run out!");
                timeRemaining = 0;
                timerIsRunning = false;

                if (!timerIsRunning)
                {
                    TimeOut();
                }
            }
        }
    }

    if (!timerIsRunning)
    {
        ReachFinishLine();
        DisplayTime(timeRemaining);

    }
}

void DisplayTime(float timeToDisplay)
{
    timeToDisplay += 1;

    float minutes = Mathf.FloorToInt(timeToDisplay / 60);
    float seconds = Mathf.FloorToInt(timeToDisplay % 60);

    PlayerPrefs.SetFloat("Minutes", minutes);
    PlayerPrefs.SetFloat("Seconds", seconds);
    timeText.text = string.Format("{0:00}:{1:00}", minutes, seconds);

    float highscoreMins = PlayerPrefs.GetFloat("Minutes");
    float highscoreSec = PlayerPrefs.GetFloat("Seconds");

    if (minutes > highscoreMins || seconds > highscoreSec)
    {
        PlayerPrefs.SetFloat("Minutes", minutes);
        PlayerPrefs.SetFloat("Seconds", seconds);
    }
    Debug.Log("HighscoreSec : " + highscoreSec);
}

public TextMeshProUGUI timerText;
public bool timeIsRunning;
public float timeRemaining = 10f;
public M_GameManager _GameManager;
public int indexlevel;

private void Awake()
{
    indexlevel = PlayerPrefs.GetInt("Level");
}

// Start is called before the first frame update
void Start()
{
    _GameManager = FindObjectOfType<M_GameManager>();
    timeIsRunning = true;
}

// Update is called once per frame
void Update()
{
    setTimer();
}

public void setTimer()
{
    if (timeIsRunning)
    {
        if (timeRemaining > 0)
        {
            timeRemaining -= Time.deltaTime;
            DisplayTimeUI(timeRemaining);
        }
        else
        {
            Debug.Log("Time has run Out !!!");
            timeRemaining = 0;
            timeIsRunning = false;

            if (!timeIsRunning)
            {
                _GameManager.isTimerunning = true;
                _GameManager.TimeOut();
                Debug.Log(timeRemaining);
            }
        }
    }

    if (!timeIsRunning)
    {
        _GameManager.isTimerunning = true;
        _GameManager.TimeOut();
        DisplayTimeUI(timeRemaining);
    }
}

public void DisplayTimeUI(float timeToDisplay)
{
    timeToDisplay++;
    float minutes = Mathf.FloorToInt(timeToDisplay / 60);
    float seconds = Mathf.FloorToInt(timeToDisplay % 60);

    PlayerPrefs.SetFloat("Minutes" + indexlevel, minutes);
    PlayerPrefs.SetFloat("Seconds" + indexlevel, seconds);

    float highscoreMins = PlayerPrefs.GetFloat("Minutes");
    float highscoreSec = PlayerPrefs.GetFloat("Seconds");

    if (minutes > highscoreMins)
    {
        //new highscore
        PlayerPrefs.SetFloat("Minutes" + indexlevel, minutes);
    }
    else if (minutes == highscoreMins)
    {
        if (seconds > highscoreMins)
        {
            //new highscore
            PlayerPrefs.SetFloat("Seconds" + indexlevel, seconds);
        }

        timerText.text = string.Format("{0:00} :{1:00}", minutes, seconds);
        Debug.Log("your time = " + string.Format("{0:00}:{1:00}", PlayerPrefs.GetFloat("Minutes"), PlayerPrefs.GetFloat("Seconds")));
    }
}

that's my current script to save the bestTime. and this script call on the game, when died the timer value or time remaining = 0 and when the car reached the destiny timer will be stopped but the value saved to best time I confused here about saving that value and save it on each level

I store that Timer Script on this

#region reachingFinish

public void ReachFinishLine()
{
    StartCoroutine(ReachingFinish_DeadFuel());
}

IEnumerator ReachingFinish_DeadFuel()
{
    yield return new WaitForSeconds(1f);
    if (isDead)
    {
        if (spawnFxPos != null)
        {
            _TimerSystem.timeIsRunning = false;
            Debug.Log("Triggering");
            GameObject go = GameObject.FindGameObjectWithTag("Truck");
            Destroy(go);
            StartCoroutine(Camera.main.gameObject.GetComponent<M_CamerShake>().Shake());
            Instantiate(explosionFx, spawnFxPos.position, Quaternion.identity);
            Instantiate(theUnicornFx, spawnFxPosUnicorn.position, Quaternion.identity);
        }
    }

}
#endregion

public void DeadPanelCall()
{
    PlayerPrefs.SetInt("Coin", coinAmmount + currentCoin);
    endCoinCollection.text = PlayerPrefs.GetInt("Coin").ToString();
    timeDeathPanelText.text = _TimerSystem.timeRemaining.ToString() + " Minute";
    deadPanel.SetActive(true);
}

also here the when car triggering:

public M_CarController carController;
public GameObject confettiFx;
public Transform confettiPos;

private void Start()
{
    carController = FindObjectOfType<M_CarController>();
}

private void OnTriggerEnter2D(Collider2D collision)
{

    carController._GameManager.isDead = true;
    carController.motorPower = 0;
    Instantiate(confettiFx, confettiPos.position, Quaternion.identity);
    carController._GameManager.ReachFinishLine();
}

 public void TimerSystemOn()
{
    if (timerIsRunning)
    {
        if (timeRemaining > 0)
        {
            timeRemaining -= Time.deltaTime;
            DisplayTime(timeRemaining);
        }
        else
        {
            if (timeRemaining <= 0)
            {
                Debug.Log("Time has run out!");
                timeRemaining = 0;
                timerIsRunning = false;

                if (!timerIsRunning)
                {
                    TimeOut();
                }
            }
        }
    }

    if (!timerIsRunning)
    {
        ReachFinishLine();
        DisplayTime(timeRemaining); 

    }
}

void DisplayTime(float timeToDisplay)
{
    timeToDisplay += 1;

    float minutes = Mathf.FloorToInt(timeToDisplay / 60);
    float seconds = Mathf.FloorToInt(timeToDisplay % 60);

    PlayerPrefs.SetFloat("Minutes", minutes);
    PlayerPrefs.SetFloat("Seconds", seconds);
    timeText.text = string.Format("{0:00}:{1:00}", minutes, seconds);

    float highscoreMins = PlayerPrefs.GetInt("Minutes");
    float highscoreSec = PlayerPrefs.GetInt("Seconds");

    if (minutes > highscoreMins || seconds > highscoreSec)
    {
        PlayerPrefs.SetFloat("Minutes", minutes);
        PlayerPrefs.SetFloat("Seconds", seconds);
    }
    Debug.Log("HighscoreSec : " + highscoreSec);
}

that's my current script to save the bestTime. and this script call on the game, when died the timer value or time remaining = 0 and when the car reached the destiny timer will be stopped but the value saved to best time I confused here about saving that value and save it on each level

I want to save it in the bottom text.

also here the when car triggering:

public M_CarController carController;
public GameObject confettiFx;
public Transform confettiPos;

private void Start()
{
    carController = FindObjectOfType<M_CarController>();
}

private void OnTriggerEnter2D(Collider2D collision)
{

    carController._GameManager.isDead = true;
    carController.motorPower = 0;
    Instantiate(confettiFx, confettiPos.position, Quaternion.identity);
    carController._GameManager.ReachFinishLine();
}

I want to save it in the bottom text.