Sounds like you're doing well. I'll second what Gant said - don't worry about when it's going to pan out, or what being an intermediate lifter means. I've done SS, read all of Rip's books, but it sure as hell made me overthink my training (which ultimately lead to overtraining and complete lack of progression for awhile). It was entirely my fault, but I see a lot of people trying to fit themselves neatly into categories when it isn't necessarily helpful. mass gain is one of those times.
Hell, eat enough and you'll be able to hang around weekly linear progress for a good while.