Today, the futures price is at 282 and the premium is now at 13 . If you exercise you will be long in futures from 270. If the futures market is at 282 then your open trade equity would be 12 . Don't forget that you give up the 7 you paid in premium making the net profit potential 12 -7 or 5 cents. In other words, you have no 'incentive' to exercise.
Open interest is the accumulated total of all currently outstanding contracts.
An updated status of your account is available from your broker on a daily basis based on these figures. There is no right or wrong answer to this question. The markets are very dynamic and react to a massive variety of different types of information -both fundamental and technical. I'm not understanding how commissions work. Commission rates are commonly quoted in roundturns.