I was surprised, too that the car does not have this feature. It appears that the standard now is for the charger you use to itself have that timing built in? We got a chargepoint charger which does the trick.
I have already received new updates and features via google play for the app on the car AND on the phone. These updates are separate from the main vehicle firmware updates. Currently, the vehicle updates are only available via a dealer visit or those that were hand selected that got them via OTA (not me).
Concerning charging timers, I think it's possible that only the app needs to be updated. They might already have the underlying framework built-in to the firmware of the car, but lack the GUI for the user to configure it.
Anybody having problems with XM Sirius update that just came out a week ago. It worked fine for a week and now the screen is frozen you can still change channels but the screen is frozen.