LOL, our last cat, Tiger, was like that for almost a year after we brought him home from the Humane Society. Even though the Humane Society didn't know anything about hm other than he was neutered, declawed, and estimated to be 3 - 5 years old, he was someone's pet and not feral.Yeah I'll do it. It feels like I have a strange magical creature in my house that just poops and eats but I can't see or touch.
As many others have said, patience is key. It cannot be stressed enough. Cats can't read a clock or a calendar.
Hang in there, you got this