I don't know how you are managing them, specifically the lights John mentioned. And different birds are different. They don't always do the same thing.
Some birds are fast molters and some are slow molters. You want the fast ones because they get over it and are more likely to go back to laying eggs. The slow molters usually start early and stay late. The fast ones start late and get over it. I'd think if yours have not started by now, it's probably a good sign. Of course, if it is so gradual you don't even notice them molting, that's not good. Some of mine, the only way I can tell they are molting early on is all the feathers flying around.
I've noticed that a hen that hatches a brood late summer often molts while she is raising the chicks. That way she is ready to go back to laying soon after they are raised and she has finished her fall molt. Just another reason to like a broody.
Some birds are fast molters and some are slow molters. You want the fast ones because they get over it and are more likely to go back to laying eggs. The slow molters usually start early and stay late. The fast ones start late and get over it. I'd think if yours have not started by now, it's probably a good sign. Of course, if it is so gradual you don't even notice them molting, that's not good. Some of mine, the only way I can tell they are molting early on is all the feathers flying around.
I've noticed that a hen that hatches a brood late summer often molts while she is raising the chicks. That way she is ready to go back to laying soon after they are raised and she has finished her fall molt. Just another reason to like a broody.