We're still having a good flow in our area, as far as I can tell. I have supers on all my hives except for the 2 splits I made June 13th. The hives I started from packages at the beginning of May have one, the rest have 2 or more. One hive has already outproduced what it made all of last year. The big time to pull supers seems to be mid-August. This is just my experience from 2 years past, though.
If you have both brood boxes full, or nearly so, I'd put on a super of foundation and another one in a few weeks, depending on how they draw the first.
-- Kris