How much should my 9wk old mastiff puppy weigh?

I just bought a 9wk old male English Mastiff puppy. He is now 9wks and 3 days old. He weighs 22-25lbs (hard to keep him still) and he is 15 inches tall at the shoulder. Is he proper size for his age? He has Groppetti and Lazy D champion bloodlines. His dad weighed 220+ and mom 130+ not sure of their heighth but daddy was really "massive" but not as tall as his mom. I am hoping Zues will get BIG like 220lbs or more and tall. I know not to overfeed and all that I was just wondering if he is small, average, or big for his age. You cant see his ribs and he is "solid".Thanks in advance. I will be taking him to my vet but he is out on vacation till next Monday.