This gives Facebook a few years to keep doing business as usual, with all of the legal action.
Apple will be forbidden from enforcing their tracking restrictions until all this is settled, and....with the amount of appeals a deep pocketed corporation such as Facebook has...it might take a while.
Only if FB gets an injunction which seems unlikely to happen. If Apple releases the update beforehand, it would make that much less likely to have them undo it - not that I think that an injunction is likely anyway, but it would make it even less likely.
The sooner Apple releases the 14.5 public beta which seems likely to be the release that includes this, the better so that it is out there. I was hoping the first beta dev release would be out this week.