if you feel the 5-10 sec processing time will be too much for you..
Is it that little?
For me it would be: Get phone out of pocket, SWIPE UP, do face recognition, FIND (side-scroll) to get to page of icons with TESLA, launch that. I have 3 cars and a house in the APP, so likely to have to SIDE SWIPE to get to the right car (and risk that I'm in a hurry and disconnect a different car, that actually needs to charge ...)
So in practice I never do that
I would, instead, open drivers door, lean in, tap screen to get the CHARGE pane up (hopefully not just-missing and changing my preferred %AGE to MILES, and then having to put it back again), and then STOP CHARGE ... then walk to the back of the car to unplug, and back to the drivers door again.
As it happens I don't need to do either of those (I have Tesla charger wand-with-button), and if I did I expect I would refine them to be better - such as configuring Siri (not something I use; is it going to hear that with the phone in my trouser pocket?)