The Broadneck Park site in Annapolis is having major electrical work - several new cabinets installed, and more in the parking lot. This is one of the original 800 sites, and actually has a shelter building, along with a precast shelter that was probably installed when the system was refreshed / rebanded 10 or so years ago.
The Solley site is also under active construction - looks like new transmission line has been run up the tower structure, maybe a new generator and shelter. Solley also has a cinderblock building that appears to date back to when the 800 system was first installed.
Greenbury Point looks untouched, but has always had multiple shelters and backup generators.
Jessup VFD Co 27 site looks to have new antennas. Probably other new equipment but inaccessible.
The new site at Shipley water tank near Arundel Mills looks to be complete with a new shelter and fencing, although the antennas look used, lol.
The new site in Piney Orchard / Odenton water tank site also looks to be complete, but with new antennas.
The new Hotel District site near BWI appears complete. This is a weird looking short commercial tower equipped with lower gain antennas, but on a relatively high elevation for the area.
The Northern District site appears to be updated with new antennas and shelter.
The Old Eastern District site also appears to be updated. The adjacent fire station is being replaced with a permanent structure under construction - too bad it on't be totally visible from the road.
The Gambrills / Crofton site looks to be completed.
The two sites that I have not seen recently are the Maryland City site and the Sudley site.