I don’t think pumping will do much if anything at all towards girth. I’ve been doing some years ago for about a year, 3 days on - 2 days off.
I didn’t get anything besides the temporary fluid build-ups, no gains in 1 year pumping.
Perhaps others have better results, but I’m quite small myself, I think the larger your member is to start with, the more gains you can expect, but not from pumping IMHO.