i might do that - the email i received from PGE gives instructions to log in to a PGE website to see the status of the paperwork but i don't seem to have any credentials for that website. so not sure (besides calling them, as you suggest) how to proceed.
I would just call the PG&E Solar Customer Service (877-743-4112), when prompted just select new or existing solar customer. Call was usually picked up fairly quickly the few times that I had to call before. They would ask for the reference number, if PTO application was submitted by Tesla you would have it in emails from Tesla, if you don't know or don't have it then just say you don't have it and give them your PG&E account number. They can only inform you of status, though every time I called they'd been helpful they never suggested that they could fast track the application, usually the hold up is on Tesla side. My impression is that PG&E will approve it within 5 business days if everything is in order, of course, some people found that not to be true.