To display the tire pressure use the voice command 'Tire Pressure" or swipe to the left at the bottom of the screen display where the vehicle graphic appears.
If none of the TPMS sensors appear to be working, i.e. none of the tire pressure readings display on the screen after driving a short distance then you should open a service request via the Tesla app.
This issue may also resolve the next time your Tesla vehicle downloads, installs its first software update.