Do you have one or two brood boxes? Are they completely drawn and full of bees? When did you add the super?
They were likely not strong enough earlier in the year as they are a new colony and there may not be adequate nectar flow (until about now, probably for you in RI) foe them to put anything away since the late spring.
It does look like they’ve done some work on completing the flow frames.
If the brood box(es) are fully drawn and full of bees then you could probably wait and see if they work the flow frames more but in a few weeks you’ll have to pull the flow super off for winter and may need to feed them, depending on what things look like inside.
Before @Dawn_SD says anything, what’s your mite count and mite plan?