Hi VTCath, welcome to BYC :)
SOP is short for Standard of Perfection, the guide by which birds are judged. There is an SOP for every breed registered with the American Poultry Association.
Another good breed guide is the Henderson Chicken Chart, found here...
Delawares are one of my favorite breeds, and I always have a few in my flock. My best birds have come from Sand Hill Preservation, another farm dedicated to rare and heritage breeds of chickens.
They are friendly, bossy, sassy, nosy, BIG eaters, excellent layers of large to extra large nicely...