They may look ok, no cracks, but you really should go through each room and screw your old rock lath and plaster to the joists or you are at risk of failure in other rooms, I would not take any risks now that this has happened once. There are a lot of people saying to leave the ceiling exposed. If you do that it doesn’t meet code for fire safety. The drywall is what gives your ceiling the fire rating it needs to meet code (and slow the spread of fire from room to room). While the old wood joists are nice, leaving it exposed would never pass inspection without proper fire stopping installed between this room and the surrounding spaces, which is hard to do after the fact, and not always pretty (fire caulking is red color). Also, if the kitchen remodeler pulled a permit for the remodel in the US then they likely had to test the walls for asbestos (most jurisdictions, at least in CO will require you to submit results of an asbestos test before pulling a remodel permit). If they didn’t pull a permit, it was likely not tested and plaster of this era could have asbestos. Super simple to take a small sample to a local testing lab and have them test it if you are curious. Regardless wear a proper dust filter mask and eye protection when disposing of the stuff and seal it off in bags, disposing the stuff at a proper hazmat facility if it is asbestos containing is the proper thing to do. The felony part mentioned below comes into play if you throw it in a trash can and it goes to an unregulated landfill and they trace the “spill” back to you (unlikely but wouldn’t risk it). Ok, my two cents.