If they are anything like ours, they will have a bunch of supers ready to be taken off, and some stores (2 or 3 full frames) in the brood box.
You've taken the supers off - fine.
It all depends on what forage is available, and how strong the colonies are. I would expect a decent strong colony to fill 1 or 2 supers in August - which I would take off. Everything from late August/ early September onwards is theirs. We have a very strong ivy flow, so they have no problem in filling their brood boxes.
I would expect your bees to have more than enough forage to fill their brood boxes between now and winter - so I wouldn't think feeding is necessary. The whole point of taking honey early (and leaving them with the rest of the year to fill up), is that you should not need to feed. Clearly if they are light, then feed.
There is a risk that if there is a decent flow on, and you feed, that they will fill the brood early and have nowhere to lay. At this point, they might even try a kamikaze swarm - which would be pretty fatal for you as the chance of getting queens laid at the back end of the season is poor.
What I would do is check for varroa, and start apiguard early if you have it badly. We seem to have quite a bit this year, so we are going to start treatment in early Aug.