Accomplished since Sunday:
brick to grade
backfilling around the back of the house (not complete, but they definitely worked on it)
center hole filled up with gravel
some pre-slab prepwork done (not a ton, though)
There were two workers there at 6pm leveling the gravel, and a pile of wooden boards and the wire mesh-like stuff for the slab prep, so we're looking good for slab being poured Thursday or Friday. No lumber for the frame yet, but space is a bit tight in there right now so they might be waiting until after the cement trucks are done.