Pointy neck feathers are called hackles.
My Delawares are about 4-1/2 months now and I'm getting ready to start processing. Luckily, they don't crow very loud. Most of them are really big. Good luck getting some girls.
Do yours have much of a breast on them now? I finally made the decision to butcher my Delaware cockerel. He is a poor example of a Delaware. I picked him up yesterday, and his breast is really flat. He was hatched in Nov! He should be way meatier. Plus he has never had a good temperament. I will just need to look for a different line when I want some more hens. The hens I have now will still be good layers for another year I think, so I've got time. That will solve the problem of him, anyway, being in a pen all by himself. I still haven't taken pics of that condo yet. So overall, are you happy with the Delawares you got from Sandhill?