In May 2018, I had about a 200 mile drive home after picking up the Model 3. The day before the delivery appointment, I had talked to the delivery person and requested they have it charged to 100% when I arrive. The car appeared on my phone app about 15 minutes before my delivery appointment and it was just finishing up the full charge on the wall connector in the delivery bay. Back then, the only public Supercharger around was 20+ miles in the wrong direction and then nothing between there and home. There are many more Supercharger stations now, so the charge level wouldn't be as critical for taking delivery now.
The delivery/service center has an on-site Supercharger, so topping off batteries on my request wasn't a problem for them.