Sweet Potatoes, Part 2

So, I posted in August about planting the sweet potato slips, and now it is just about time to harvest. Last weekend I dug around to see what I could find, and I did find a sweet potato that was about 6 inches long, about 1 inch in diameter. From what I have read, once it gets cold and the leaves begin to die, then you harvest. They need to fatten up some first! I don't think they will be ready for Thanksgiving. I will post pictures when it is time to harvest!