Lex Fridman talked to Mark Zuckerberg about this just a few days ago [0]. It didn't sound like Meta is has good answers for how this should be done. So it seems unlikely that they'd be significantly more than 6 months into research like this (as the tweet chain says). It seems like Meta is exploring AI avatars, but for much more practical, menial tasks.

[0] https://www.youtube.com/watch?v=MVYrJJNdrEg&t=1994s