After loadlevelasync, will AsyncOperation be isDone at least one frame?

I am wondering, if I use SceneManager.LoadLevelAsync, and check for AsyncOperation.isDone, can I be sure that isDone will be true at least one frame before the current scene gameObjects are destroyed and the new scene is effectively loaded? Or at least, can I be sure that there will be at least one frame with let's say, a AsyncOperation.progress of 0.9 or more? Even for example in case of very performant devices. I would like to execute something just before the current gameObjects of the current scene are destroyed, and if possible, without using DontDestroyOnLoad. And AsyncOperation.allowSceneActivation is true. Thank you!