Only, they're aren't exactly showing real time.

Noted that the westbound train displays at North Station and Haymarket have been activated.

However, instead of displaying (for example) "Heath St 5 MIN" and "Clvnd Cir 8 MIN", they are displaying (for example):

"E) 1 Stop Away" and "C) 2 Stops Away"

Additionally, the westbound sign at Boylston has also been changed to display the updated format.

Leave it to the T to take a good idea that was properly and reasonably implemented for eastbound trains and wreck it (no pun intended) for westbound trains.