Some moving men had just begun their day's work.
The first thing they brought into the house was a huge couch.
The owner came in and asked how everything was going. They replied, "Sofa so good."
Listen up, genius! The joke is that the moving men are making a pun. They just moved a sofa and when asked how it's going, they say "Sofa so good" which sounds like "So far so good." See? It's funny because of the similar sound. You probably still don't get it, but hey, at least I tried.
heh..
Oh.My.God.