I always suggest to nuc customers that when they get home and the bees get settled (a couple days) that they should move the two outside frames out one position when they install them in a ten frame box. So what they have is this...
Position:
1 - Foundation
2 - the first frame from the nuc
3 - foundation
4 - Brood from the nuc
5 - Brood from the nuc
6 - Brood from the nuc
7 - foundation
8 - the last frame from the nuc
9 - foundation
10 - foundation
A strong nuc can be opened up like this probably in most areas as soon as you get them, assuming they are being produced locally. (You may get a nuc from down south in early April and have them shipped north, but then the weather may be at odds of you breaking open the frames like stated above.)
Then within two weeks, it usually is time enough to add the second brood chamber. And you can remove the center two brood frames from the original bottom box and place them in the center of the new upper box. Many factors go into how many frames to move, whether to move up honey frames, etc. For instance....As a general rule, do not place foundation in between frames of open nectar or uncapped honey.