You have to separate breba and main crop. Brebas are typically larger. After that, there are several main-crop figs that are 1/4 pound (4 oz) or more. TyTy has figs that size of soccer balls, which would probably weigh 5-10#, realistically.
Possible largest figs would be Black Mission, Brown Turkey, Texas Blue Giant, Walker, Deanna, Jack's Quarter-Pounder.
However, some of the best pigs are no where near the largest. I will take 3 small killer figs over one giant mediocre fig, any day,