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https://docs.unity3d.com/ScriptReference/AsyncOperation-progress.html

Unity - Scripting API: AsyncOperation.progress

 

 

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using TMPro;

public class LoadingSceneManager : MonoBehaviour
{
    private static string nextScene;
    [SerializeField] private TextMeshProUGUI progressText;

    public static void ChangeScene(string sceneName) {
        SceneManager.LoadSceneAsync("LoadingScene");
        nextScene = sceneName;
    }

    void Start()
    {
        StartCoroutine(loadScene(1f, nextScene));
    }
    
    IEnumerator loadScene(float delayTime, string sceneName)
    { 
        AsyncOperation asyncOperation = SceneManager.LoadSceneAsync( sceneName );
        asyncOperation.allowSceneActivation = false;
        progressText.text = "Progress: " + asyncOperation.progress;
        
        yield return new WaitForSeconds(delayTime);
        asyncOperation.allowSceneActivation = true;
    }
}

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