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.