How would I add a scene delay timer to my script?

It is an on click button to change to the next scene.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class Pressstart : MonoBehaviour {

	public void PressStart(string CharacterSelect)
	{
		
		SceneManager.LoadScene(CharacterSelect);
	}
}

Why not use a coroutine for this?

Something like this…

 public class Pressstart : MonoBehaviour {
 
     public void PressStart(string CharacterSelect)
     {
         
         StartCoroutine(LaunchScene(CharacterSelect));
     }

    IEnumerator LaunchScene(string CharacterSelect){
        yield return new WaitForSeconds(5f);
        SceneManager.LoadScene(CharacterSelect);
    }
 }

This would load the scene 5 seconds after pressing the button. Just change the 5f to whatever delay amount you want.

Hope this helps,
-Larry