Do you have an advisor assigned to you that you can call or email? This is the best way to both answer your question and also to push to have the work done sooner (particularly if you are seeking to claim the 26% federal credit this year before it drops.) It seems like the time from permit to install can vary for a number of reasons, from parts availability (PWs, in particular, are scarce) to installer availability to luck and persistence (sometimes it seems Tesla loses track of orders, and also sometimes a well-timed call and good advisor might catch a cancellation/re-schedule elsewhere and get you scheduled very quickly.)