Could I then press charges on him and even sue for time off work and court fees and if not, how would I stand in trial?

This past weekend around 1:30 am, I was talking to a girl on a dance floor. A guy comes up and pushes me from behind. I turned to see who was there and when I turned back around, her boyfriend pushes me again then puts his hands up. I hit him in the face and he went down. His girlfriend ran to his side. I saw he wasn’t getting back up and I immediately exited the bar. They ran after me yelling and hailed a cop while I was walking down the street. I was arrested and charged with assault and battery. This is what I told the police and I was told he would be pressing charges. I’m going to sign a contract with my lawyer in a day or so and the first thing he will do is subpoena the bar for their surveillance footage. I have a witness who is also willing to testify. Is this likely to be dismissed?