Yes, they are laying right now, that is why I started giving them laying mash.
It might have been mentioned already ........ but have you Wormed them ? ..... with a good wormer and then again 10-15 days later . On most wormers i would do each time '2 to 3 days in a row" with each individual . Some good wormers (imo) = vabazeen , safeguard , telmin , nemex (puppy wormer)(i never worry about over worming with common sense as under-worming just give the worms immunity) , there a few more i can't think of right now ..... i would not use ivomec now but later on .
Also they might need spraying with "Adams flea & tick spray" blue bottle ..... this is for mites , feather mites & lice .
Seperation from the general population is very good .... and applying the blue coat liquid or spray on raw areas .
You've gotten good info from these group members on meds that are essential also and probably needed right away .
I worm and medicate at same time .
I've used and really like "Imodium" (advanced) anti-diarrhea for humans with them .(it's good stuff)
I'm not a vet nor do i play one on tv ..... these are just things i've tried , heard and read about .
Wishing you the best with your birds .