Greetings
farmer.melissa,
Yup, they are way, way overdue.
Any chance, you bought straight run chicks? Meaning they were unsexed...and you may have unknowingly bought, all roosters. This happens all the time.
They are about 10 months now, and pullets usually lay their first egg around 18 weeks (4.5 months) or a little later, depending on the breed. My Buff Orpington's for example laid their first egg at about 6 months old, but my New Hampshires laid at about 5 months old, so it varies.
But if they are roosters they should have started to crow by now. Cockerels too, have an average time that they crow, again depending on breed. They usually crow around 4-5 months of age, but I have had some start at 2 months old.
Upload some pictures and the members here at BYC, will give you their views on the situation.
These are my thoughts, I hope they were helpful.
God Bless