You'd want to remove all the cockerels to a bachelor grow out pen. Usually, people process them around 5-6 months of age. If you kept all the boys in with the pullets, the pullets would be brutalized and the egg production would drop dramatically.So how long does it typically take to raise a rooster until time to harvest?
and do I just keep all of my flock together?
If you want to keep one good cockerel, once they all reach sexual maturity, you could put a different boy a week in with the ladies and see how he behaves with them and with you. It does take time for them to learn manners and how to win over the girls but some seem to be better coming out of the starting gate than others. And RIRs are notorious for having human aggressive roosters so you'd want to watch out for that. But each bird is an individual so you just never know.
There are benefits to having a rooster or two in your flock other than making more little chickens.