It may just be the time of year and availability of contractors. Here in my town there was a bunch of roadwork going on until this week. A major railroad crossing was closed for 6 weeks and traffic was diverted close to a mile out of the way. Last time I was through there (a couple of days ago), the work was far from done. They got the railroad crossing opened, redid the lanes to divert traffic onto the newly paved portion and rope off the next part of the job, then they packed up and left. There was no work going on.
This time of year retail is going bonkers, but most other businesses are fairly quiet with a lot of people taking vacation. It may be that Tesla can't find contractors willing and able to do the work right now. It may also be that the regulatory agencies they need to work with to get permits, inspections, etc. are short staffed due to vacations and nothing is happening on that end.
