Sammy Sosa is the Cubs all time leader in home runs with 545 (1992-2004).
Barry Bonds with 756 career home runs.
Barry Bonds of the San Francisco Giants, with 762 HRs
In 2007 Barry Bonds became the MLB all time home run leader when he hit #756 passing Hank Aaron who had 755. Babe Ruth hit 714. Then Willie Mays who hit 660.
Sammy Sosa - 545, Ernie Banks - 512, Billy Williams - 392