Is there an F5 tornado in Oklahoma City right now?

No. The Oklahoma City metro area has only ever recorded 2 F5/EF5 tornadoes on May 3, 1999 and May 20, 2013. The chances of an F5 or EF5 tornado being on the ground anywhere at any given time are extremely small. And even then, the actual rating of a tornado is not determined until after it has passed.