Give then at least a week or 2 to establish home and slowly start letting then out in the later evening preferably when you can watch them to make sure they return to the coop at dark. Once you are comfortable with then returning on thier own you can exstend the time they freerange
Give them a week to get comfortable in their cooo and run.You can start free ranging but keep a close eye on them,adult birds are way better at keeping an eye out for predators.You can stop supervising them so much once their about four or five months.