Well, not the update I expected to post, but better than nothing:
The buyers asked for a 24 hour extension on our counter offer. Turns out that they were outside our house for 2.5 hours trying to get their boat (must be a land yacht) to go up the driveway. Something about the motor being too large. While they are deciding what to do (back out, find an older house with more land, find a newer house with more land and no HOA), they need time. Apparently one of the kids got sick, and the husband had to go to work, so our deadline of 5 p.m. PST today is too fast.
We gave them the 24 hour extension. No harm done.
I just hope to be giving better news tomorrow. Right now I'm just disappointed to not have it over with, one way or the other.