There’s a happy medium between death and ad lib food. If they’re free range and you stop supplementary grain eggs will likely decrease a bit. If they’re in a pen, you can feed them less, best to give them other stuff like green veg, a big rotten tree stump, cut turfs to keep them active and pecking... eggs will tail off, but yeah, watch their behaviour, pick them up daily to feel condition and don’t let them die!