That's over 1,200 lbs. You didn't list actual size of tubing or wall thickness, but I'm not a fan of the way those legs look attached.
Also, you may want to consider some kind of footing or something to keep that stand from falling over if there's an earthquake, someone hits the structure, etc. It's going to be top heavy, and you'll want something to provide better stability.
Last thought is what kind of structure is this being placed on? Concrete - no problem. Joists? You are putting a lot of point pressure on the same ones. Make sure the structure can handle this ok.