If you read the description for the particular "quick quilt" it may tell you what is cut. I just checked the one for the Confetti quilt and it says "And quick, too since lots of the cutting is done for you."
Some kits include charm packs, layer cakes, jelly rolls, etc. and, if you use those fabrics as they are, then they would be pre-cut. Other fabrics in the kit would be sent in yardages.