The fact that they reacquired the signal exactly on time is a very good sign
If the burn was the least bit off, reacquisition of signal would've been at a different time that predicted. If the MOI burn had ended early, then the reacq would've come earlier than predicted because the velocity would've been higher than desired. Conversely, had the burn gone long or had removed too much velocity, reacq would've come later than predicted.
Good news indeed!