Most birds will want to moult towards the end of summer after the breeding season, and grow their new feathers for winter warmth and spring breeding plumage. But we have interfered with nature so much regarding laying hens, that their clocks can go wrong.
Unless a bird is hatched very early in the year it should not need to moult in its first 18 mth or so of life ie POL bought in the summer should theoretically lay all through the winter and on until the next autumn
The moult should take around 12 weeks but apparently cold weather conditions will halt the moulting process, so if birds can be kept warm during their moult they should get it over quickly
I would guess yours will be back in lay soon and then keep going for quite a few months.
If you bought some commercial POL now they may possibly lay on through without moulting, then buy your next lot so they want to come into lay at the end of Oct early Nov.
Most hens will go completely off lay during the moult, but the modern hybrids will sometimes still manage to produce a few eggs