It's quite ordinary to put an adverb after the tensed auxiliary in a verb construction.
I have recently discovered a new manuscript by Byron.
The investigators will soon be able to tell us whether our suspicions are correct.
Note, however, that the perfect is inappropriate where you have it
It is now a year since we
have last discussed your future.
In your sentence last discussed locates the discussion in the past, we don't use the present perfect with an exclusively past reference. The perfect might appear in the matrix clause, however, because the preposition since designates a timespan which stretches up to the present:
It has now been a year since we last discussed your future.