You didn't say, but is sounds like this is a first year hive. If that is true, it is doubtful that will get much if any surplus honey this year. I would concentrate on getting the two brood boxes completely filled out and making sure there was enough honey/pollen to get the girls through the winter. Once all the frames are drawn out--not necessarily full of brood and honey--you could/should add a super to make sure the girls feel like they have room to expand/don't swarm. But on my first year hives, I usually concentrate on getting a 2/3 deep brood chamber well established and don't worry so much about suppers, unless there is a terrific flow on, but even then, it is doubtful that the queen will have built up sufficient population numbers to take advantage of the flow and store much surplus honey.
Linda D