Latest I could find on the proposals was from 2021, although I swear I have seen something more recently suggesting it was moving forward.
It is funny, though, I was thinking of adding a bit on my comment about the CharlieCard 2.0 and GLX debacle and how well that didn't work out. The Type-10s are still years away, though, and are going to require significant infra upgrades anyways (including I believe the loop at Heath, and then raising all the platforms on the E), so, it's not like there isn't a ton of other dependencies on actually getting them running.