Great pix’s of your frames ! You seem to have a fair number of bees on your frames but not near enough work force n lack of space (Use cells/full cells with nectar n brood) to indicate they are ready to push up into a second Super (Your Flow-Super) yet.
Let me say, “Patience is a virtue” especially in beekeeping. Until you have a huge work force of worker bees, a very good nectar flow not just a fair nectar that keeps your bees feed they will NOT NEED the Honey-Super (Flow-Hive).
Looking close n carefully at the one plastic Flow-Frame I see no evidence of your bees working/sealing the cracks to enclose the individual cells.
In a few months (I live in the Northern Hemisphere near Seattle, ) I will begin my third honey season. I’m encouraged this might be my success season. My first honey season I got started too late n miessed our main nectar flow but my bees did work n prep my Flow-Super bridging n filling the gaps. But not enough time to store Honey. Last year 2017 (our second season) started okay n my bees were willing n ready ! We were not successful honeywise again but for another reason … my bees had started depositing nectar in the flow but our summer weather turned very hot n dry leaving us with very limited flowers for my bees to forage. Thus with the bees still needing food they quickly moved the stored supply of honey down into my lower boxes (supers) n the Flow-frames were now “Empty” a second season. It wasn’t the flow-supers fault this time but a dreath caused by the weather. I have two hives with Flow-supers n 4 more conventional Langstroth hives with double deep boxes n then shallow honey supers on them. None of my hives produced much extra for my 2017 season. Now waiting for the beginning of my third season here 2018.
One thing (Dawn mentioned already) is push or rub any extra scrap bees wax into your plastic Flow-frames to help give the new frames a odor n used smell the bees like. I was lucky n had a block of used bees wax which I melted down n then rolled the hot melted wax onto all my new Flow-frames.
All my Flow-supers are in cool winter storage but are ready once my bee have built up n filled my two lower deep boxes. (Here we have to use two double deep (one lower brood box n one upper deep Super for winter over honey supplies to feed our colonies during our four month winters))… here a couple pix’s of my Flow-frames n cells with wax sealing the seams n cracks.
And here’s my winter configeration with snow. So you know I do not live in the tropics or even semi-tropics.
You seem to being doing okay … just remember “Patience” … Good luck n Happy Beekeeping,