Well mentions that they plan to do that but are still "testing" it all. Kind of misleading though as they never mentioned that turning on UWB didn't actually stop it using bluetooth to range find and unlock the car. It was a fair assumption for most of us that the car would be more secure.
I think to be clear here this isn't a limitation of UWB, Land Rover have been using this in their key fobs for years on newer models without I believe a known attack to breach it. This is just Tesla not implementing it properly / fully at this point.
Two weeks as Mr Badger says
Guess also maybe not in a massive rush on their side because Android's UWB API stack is still in Alpha so they cannot put this on Android for probably quite a while yet.