Until you see how your dogs react to the chickens, you won't know for sure if free ranging them together is a possibility. I don't risk it at all - the dogs are inside the house when chickens are out, chickens are in a run when dogs are out.
How well trained are your dogs? Do they reliably obey Leave It? If not, that's the first thing you should be working on with them.
At the start you can try letting them see the chicks to gauge their reaction but use good judgement on whether or not that's something that's safe to allow to continue (it'll be stressful to the chicks if the dogs are excited, barking, leaping). I would not trust leaving the dogs in the same room as the chicks without supervision. If the dogs respond well (disinterest would be the best reaction) then as the chicks grow up you can consider letting them meet with either a secure fence separating them, or the dogs on leash so you can react quickly if they make a move.