They didn't specify an actual time but just said mornings! So it could still take one to three hours, don't lose hope! I'm sure we get the update soon enough :)
Viewing post in Step 4 Launch: Sept 18th, 2021! comments
tbh I'm not sure HOW they're gonna update it. With the DLCs you got an extra file to add to your game yourself. Other game creaters usually post another post where they specifically say that the game is now updated and ready to be downloaded. I see the download options too, but I think these ones are still the old files?