Hello
If they are fully feathered, they will be fine, especially if you have a heat lamp out there. Do they have an attached chicken run? You will probably have to put them into the coop at dusk. Just be sure to wait until it's just almost dark, then they will clump together and peep, and you will be able to catch them easily.
Good luck! They will be just fine! Usually by this time, I'm always sooo glad they are outside, and I'm sure they're getting bored in the brooder, and they will be a bit afraid, but they'll start lovin' it real quick!