I love your opening story, so I have to follow along!
They do look nice and healthy, but once you get them home, you will want to give them some proper nutrition. Do you have a Tractor Supply or Rural King nearby? Maybe even a local Ag store that sells chicken feed.
The girls don't appear to be of laying age yet, but close. Maybe 3-4 months old? Just my guess, there are others here that are better at that guessing game lol
Its so nice that you want to take care of them, after someone apparently didn't.