My android app updated today. In the upgrade area, the software section, there is now a "Cold Weather feature" upgrade. It shows the rear heated seats, but the description says "Includes Heated Steering wheel" for $300. Mine is a SR+ that I picked up Oct 2021.
Oops, just bought it after typing the above, tried it and it works. The controls are listed in the climate control panel. Didn't care much about the heated rear seat, but wanted the heated steering wheel.