Oh, they finally got that done. That was supposed to be done back in 2019, before the next carrier in the Ford class (CVN-79, the Kennedy) was launched.
They're still having problems with the electromagnetic launch system. Not, apparently, in the catapult itself, but in the system that powers it. Which is a big flywheel/generator thing. Output is about a megawatt, comparable to the highest performance Tesla cars.
The thing was designed about 15 years ago, before high-power electric car technology was widely available, so it's all custom. The next generation of this will probably be built using off the shelf electric auto parts. Probably on the PLAN's Type 003 aircraft carrier, scheduled for launch next year.