A NASA article on the status of the X-57 “Maxwell” says that they’re wrapping up work on it, with no mention of it actually flying:

X-57 Project Creates Paths Toward Electric Aviation

The X-57 is a modification of an existing conventional aircraft to be all-electric. Lots of new technologies were integrated and apparently some useful advances were made, but the real issue remains batteries. Until the energy density of batteries gets a *lot* better, electric-powered aircraft are going to remain pretty niche. Flying the X-57 would be nice, but with the existing batteries it’s kind of dead in the water.

What would be great is if NASA kept working on the X-57 at a low level. The technologies onboard would be occasionally upgraded, and when meaningfully better batteries – or perhaps some sort of modular fuel cell system, perhaps, or indeed a small nuclear reactor (a man can dream) – become available, integrate them into the vehicle and at last fly it.