Give them another week and you're really going to see some serious flapping!
I had one of mine get so carried away with herself at 2 weeks of age that she flapped herself clean clear out of the bath tub!
It was shortly after that incident that I decided they had outgrown the bath tub....good-bye tub brooder, hello closet!!
Just relax and enjoy this stage. They're so entertaining from here on out.
On moving them outside, a lot is going to depend on your weather conditions. (i.e. cold and or wet) If you're having nice warm days and mild nights (above 50F) then they could probably go outside at about 4 weeks of age. But, if you're in a climate like ours, we had to wait for things to warm up a bit. The chicks didn't go out until they were 6 and a half weeks old. But, you could put them outside for the daylight hours and bring them back in for the night. Lots of people do that.
So, when do we get to see pictures of your little goobers??? Must have pictures!