I kept mine in the coop a full week before letting them out so they would know that the coop is "home". I'm not sure of your situation, but I wouldn't be comfortable letting mine out without a fenced yard just because we have so many four legged predators around here. But like I said, your situation may be different.
If they have been in for a week than you should be fine to let them out. I would use "treats" to bring them back in but I will doubt it will be needed. Or just be out there near dark to "push" them back in.