One Tap is definitely on our radar. We currently support Google authentication and it's a pretty popular social network within our suite, so adding One Tap is an obvious next step. Right now, however, we are focused on the JFBConnect v9 release which supports Joomla 4 and some other under-the-hood improvements. One of those changes will allow us to update each social network on it's own without a whole new release of JFBConnect, which makes adding new features, like One Tap, simpler in the long run.
I'm sorry I can't give a specific timeline on when it will be available, but I hope the above answers your question.
Thanks,
Alex