Strengthening any muscle for MMA will help. However, biceps are pretty freaking worthless. There is a lot of other muscle groups that are more important to train. If you goal is to look great at the beach awesome. If its to train for strength for MMA, then other exercises would be more appropriate. Some things that come to mind are squats, dead lifts, snatches, cleans, and military press. I know not a lot of your workout is posted yet and I apologies if the above are in your routine later on.