Hi Barney and welcome to the Forum.
Be of good cheer, it will be fine. However, the road to Hell is paved with assumptions. Having lots of boxes in a stack does not mean they are necessarily all full of honey. How much do they now have? Bees can really munch through it in a warm late summer - this is a good thing but means they can be light in stores.
Brood and a half should be enough to store a supplied feed if they have no alternative location to put it but...the bees may have stored all their gathered honey in the supers. If you remove them now you could find the brood and a half remaining is way too light. By “too light” I mean the overwintering boxes in October should be so heavy it is a real effort to lift on side up off the stand. If they lift relatively easily, they could struggle to last until Spring.
So to cut to the chase .. it will do no harm this time of year to quickly remove supers, assessing their remaining weight whilst doing so and set them on the upturned roof. Then heft the brood and a half by lifting one side up. If it feels really heavy, all good and remove supers and close up. If it feels quite easy to tip up a bit ( rather more likely) and the supers are really heavy, put brood and a half to one side and put supers on the floor and replace the brood box over. This is sometimes called nadiring.
If neither supers nor brood is really heavy (also likely if it is a big hungry colony), I would remove supers to extract and get hold of a 12.5kg chunk of bakers fondant from my local baker, split the pack in two lengthways and bung it open face down (leave the blue wrapping the other sides) on the queen excluder, pop an empty super round it, pop on the crownboard with something to block off the feedholes and roof on. Then you know for certain they have had at least that to work on. You could surround the fondant slabs with some insulation or an old sack but they should be fine without. They will steadily munch through the fondant and when it’s just blue wrapper left remove the super and Bob’s your mothers brother..
Keep hefting your hives each month during winter, they should start to lighten up in Feb / March but with favourable weather things should start going then anyway.
Don’t beat yourself up regarding leaving annual feeding “a bit late” I did as well. And each of the previous twenty come to think of it..
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