I don't know if it's someone "officially" endorsed by Tesla, but it's someone that the local service center manager is allowing to come on site to do cars (like mine) that are getting service for other things. They're charging a couple hundred dollars for the tinting, which seems reasonable to me. I'm going to the legal (Florida) limits on front and rear windows. I'm not sure how it would work to get the tinting done before delivery, but definitely talk to your DS and see if it's possible. They're all around there all the time (I saw Brandon come in as I was dropping off the car), so it would be easy enough for them to coordinate with your delivery. If not, they may be able to recommend someone else on the west coast to do the tinting.
One challenge of tinting your windows pre-delivery is that you have to keep them rolled up for some period of time afterwards, so you won't want to be trying out the car and opening/closing the door a lot right after getting the tint done. Just something to think about. Ideally, you'd wait a few weeks and find a time when you really don't plan on driving too much, and definitely not opening the windows for a couple of days, to do the tinting.