I'm on 914 SFO-IAD-CDG S fare

.bomb is showing only 1 seat left (in F) but departure date is still a few weeks out.

Should I do OLCI the night before or wait & check in at the airport?

Obviously I'm hoping a seat will open up in F and I'll get an op-up so that they can give my E+ seat to someone else but given I'm flying out of SFO and only a 1P, am I clutching at straws here?