Welcome to the club. I have almost exactly the same story, except I ordered my Expy Max 302a in mid-November. In production 3/23, now in a chip hold ever since. For a while Ford would offer ETAs to the dealer, but now they just say "no ETA". I agree the ETA means nothing.
Ford is actually delivering very very few Expeditions. Some here and there, but not many.
Unfortunately there's really nothing to do but wait. Anyone who says they know when these vehicles will be delivered is just guessing. Could be in two weeks, could be next January.