You can move them out now, but hang on a bit before letting them mingle with the older flock members. If possible, partition off a section of the coop and/or run for them to stay in, separate, but within sight, for a few weeks while they adapt to being outside full time and get to know the older flock members. It is recommended that youngsters are more or less fully grown you can let them mingle with with the rest of the flock, but if they free range or if you have a really big run with place for the young ones to hide out if necessary, you can try and let them mingle a bit sooner. Don't try it too soon though, wait until they are around 3-4 months old.