My understanding is that in the bay area, they do silly demos from time to time, and let people ride in them for free, but it's not an actual usable service anywhere. Like I said, basically Willy Wonka. If something has changed I'd be interested to know about it. This article is only a few months old though, and it seems to be saying the same thing.
https://sfstandard.com/transportation/how-you-can-ride-new-w...