I think this is what I will do.  But a mobile Tesla service person just responded to a voicemail with a text saying he will call after a meeting. So maybe I can get a direct helpful answer after all.

The frustration of dealing with looping but unhelpful support systems is extreme!

See: Brazil, the movie.

Caveat: Would rather deal with this than have any other car.

I say just go show up and say you were told it’s ready.

Since you will be in the area I agree with the others, show up! Worst case scenario, it isn’t ready and I would request direct contact information for the service manager. As a extra precaution, have them text you through their messaging service for that location to have an open channel

At wits end getting my Tesla X back from service!