Does standing up doing "bench" presses increase chest/pectoral muscles?

Standing up disqualifies it as a bench press. And no. Keep w/ the push ups if you don't have a bench. Also, your pecs really don't do much in a swing like that. You want a tough shot? It needs to come from your core. Your power needs to come from the torque in your hips, abs, and back. Put some weight behind it, or it really won't matter.