It's crypto and anything can be done without even meet the team face to face. There was a lot of crypto developers were doing teleconference to did a meeting or something else. The development will always still continue but just hope this pandemic will not be so long. It's really hurt to see so many countries are dying right now.
Now many people work at home due to this pandemic, so there are several projects that run it at home rather than in the office, of course, this could hamper their development because it is a little limited to meet because of this pandemic.
But there are also a number of projects that continue to run, even though in the current conditions the examples might be such as cartesi.