There is no way to know how long the dates will stay current. As an example from 2007, the dates were made current in the July 2007 visa bulletin, then made unavailable in Aug 2007, and then retrogressed in the Sep 2007 bulletin. So, the dates were current only for 1 month at that time. Whosoever was able to file i1485 in that timeframe would have got the EAD and AP. The rest would have been left out. In today's scenario, we do not know if the Biden administration will make the dates current or not. If the miracle does happen and they do make them current, I would strongly urge you all to be ready to file i485 immediately.