What wonderful news! You will be petting him soon. My little feral, Shadow loves to play with a feather wand. I would use that to pet him with too. I would slowly rub the wand over the top of his head and even under his chin. After a few days of this, I just moved my hand closer so it was on top of the wand. He didn't even know it was my hand!
I had been working with Shadow since September and was finally able to pet him the beginning of April. Of course winter made it so very hard to get much socializing done. He now comes into the house a few times a day. Has slept inside all night a few times. Uses the litter box. Is getting used to my indoor kitty Jake. We still have issues with the dog! Shadow now sleeps on our deck at night on an outdoor loveseat. My goal is to have him mostly inside with winter comes. It is a long slow process, but so worth it!