NASA/JPL announced (last week), an ION engine that can reach 'up to' 120Kw
That's a LOT.
Rocket labs new Gauss 'ion' engine, doing the rounds is approx 800W
There are different types of 'ion' engines, so I guess take a pinch of salt as each to what each TYPE of ion engine terminology is being used. I think the Rocket Lab's is a Hall Thruster effect type.