You can feed the starter even after they are laying as long as you're providing oyster shell in a separate container.
I keep a dish of oyster shell with each flock, either by the feeder or by the nests. When most are laying, I will usually mix grower and layer 50:50 because I have roosters with each flock too.
Don't you have any feed stores nearby? Shipping must be expensive for that.
Maybe I'll keep them on it until it runs out then!!
Should I put it out now or when they start laying?
And we do, 2 actually, but nobody could drive me and I wanted it immediately.
Shipping actually wasn't bad though!
This was the total