The hair will curl whether you cut it or not. It is hard to part with that soft puppy coat. Sully, SPoodle, was 6-7 months before I started cutting his hair, and 11 months when I took it down into a Miama since coat change had started and it was matting. Lost his crest. He is now a year, leg hair is still straight, body has curl, but nothing like a mature coat yet, and he is about 1/2" long and letting his hair grow out a bit.
As long as you can keep it tangle free, wait as long as you want to cut it. But it will curl. Now would be a good time to have the groomer start trimming it a bit, just to keep a nice poodle outline and shape.