The way we've been handling it for the handful of people in your situation who are wayyyyy behind on getting a BMD (super sorry
): Technically, no coverage hasn't officially begun. HOWEVER, we're not evil. If you have an issue, we'll help get the car here, and we'll use the Tesla proprietary logs (which generally go back several years and ~100k+ miles) to confirm BMS health, mileage, etc around signup time. Assuming all is well, or close enough, what we'll do is activate your plan as if you had received the BMD at the end of the estimated ship window (~60 days), perform service, and get you on your way. If for whatever reason pack health wasn't great at signup time based on the Tesla log.... we've been ignoring this so far, since it's not your fault you've been waiting for so long.
If nothing goes wrong before receiving the BMD, then you activate at that time and your 2 years officially starts from that point. So because of how we're handling it, you effectively, but unofficially, get free coverage in the meantime. Only fair, IMO.