CF used to do it, but discontinued the practice at some point. Aside from that, I can usually tell what general timeframe their scenes were filmed. For example, CF was releasing Kyler scenes until the end of 2021, but those were all when he was pre-tatted. He showed up at BHH/RB in March 2021 with a tat, so all of those aforementioned scenes must have been shot in early 2021 at the latest, maybe even late 2020.
Usually, if a model is down for a shoot, they will get 2-4 scenes out of them -- at least for the more active ones.
Basically, it just requires a person to be very observant about changes in appearance and what studios they're working for at any given point and when models are active and retire.
It would be nice to know filming dates, but it's not a requirement for the companies to divulge them on the scenes.