My process was much longer than
@willow_hiller between inspection and PTO, but that seems to be at least partly due to a need by Tesla to submit revised plans that they did not do as quickly as they could. (It may also be related to being possibly the first solar roof PEPCO authorized.) So for me it was about 3 months.
I agree we should be eligible for the peak savings days but also see PEPCO accounts are unavailable. As to it being easy money, it sort of is - but it was only for one hour of one day this year and it probably will only bring in like a $5 credit for us (with a ~8.2 kW system) - great for doing nothing, but won't be a huge change in the economics. Notably, PWs aren't even necessary for this credit since the credit is relative to your high-use days from the past month, so the big thing is it being sunny so you are generating solar. (As an aside, I attempted to set it as a peak time in the Tesla app so that it would ideally export all solar to the grid and power the home off PWs, but it did not work - not sure if that is just because I had never used advanced modes before and Tesla needed to "learn", but it did not work as intended. However, since we weren't running the A/C, we only lost about 0.6 kWh of potential savings.)
TOU rates with PEPCO are either closed to new customers, a closed pilot, or seem to be unavailable with the NEM rider. So yes, I believe they are unavailable to us.
I would second the suggestion to try out PVWatts to get production estimates. For me, August was really close to PVWatts. September was a bit low, which I am attributing to being unusually cloudy (though I cannot verify that.) PVWatts will likely give you numbers higher than what Tesla estimated.