Tesla recently changed the Charging options and it is very confusing. First, Tesla added a new capability called Scheduled Charging. Scheduled Charging enables you to start charging at a certain time (Scheduled Charging is perhaps most useful if the start time coincides with the beginning of an off-peak rate charging window.) With Schedule Charging you can enter the time when the Tesla Model Y will begin charging.
Next there is Scheduled Departure. This option was already available. What has changed is that you can now specify when the off-peak charging window ends (previously this was hard coded at 0600, your time.) If your off-peak charging window ends at 0700 you can set Tesla Scheduled Departure so that the Tesla Model Y will always finish charging before the end of the off-peak charging rate window. (This is more about being a responsible EV driver, not burdening the electric grid with EV charging during peak usage periods but it can also save you money if you have a time of use (TOU) rate plan in effect at home.)
If you use Scheduled Departure feature you can specify whether the Tesla will precondition the vehicle before you drive. You can specify whether the preconditioning happens every day or only on weekdays (this assumes you commute Monday through Friday.) If you leave your house every day, i.e. at 0730 the Tesla will automatically be preconditioned. In colder weather the Model Y will start preconditioning ~30 minutes prior to the scheduled departure time. A new feature is that you can schedule preconditioning whether or not the Model Y is plugged in.
The fun starts when you try and find these options. From the Charging Screen you can select Scheduled Charging, however from the charging icon on the left side of the Tesla status screen you won't see Scheduled Charging by default, you only see the option for Scheduled Departure. If you tap below the elongated button that is labeled Scheduled Departure where is reads tap switch to set Scheduled Charging this will toggle to the Scheduled Charging options. Also, if you want to use Scheduled Charging or Scheduled Departure after you have to set the time you also have to tap the elongated button so that it turns blue, else charging will start immediately as soon as you plug in the charging cable.
Finally, when using the Tesla app you can't set the Scheduled Charging time or the Scheduled Departure time or whether or not preconditioning will automatically start (you can manually start or stop preconditioning from the app.)