Eh - https://vimeo.com/257360045
Definitely not perfect, but this is hobbyist grade work. With the recent work around parallelized WaveNet synthesizing 10 seconds of audio for every second of wall clock time, a live fake that fools 50% of regular people is probably a couple of years away at most. Particularly if you can control the setting to ensure lighting/angles/etc match up reasonably well.