From the app, set the schedule charging time.
The app only has an option to start charging immediately. Add an option to schedule charging from the app just like from the screen inside the car. I’m overseas right now, our Model 3 is in the airport car park connected to a 13A outlet, charged to 90% (since 100% is bad for the battery). I wish I could now tell it to start charging to 100% at 10 am so it’s full when I arrive. My current workaround is to ask my wife back home to do it.
(lightly edited by moderator)