Ric Flair passed his required medical testing last week in Pittsburgh, which means he is free to return to WWE in a regular full-time role at any time. There are no plans for him to wrestle. It's rumored that he'll be paired with The Miz. They kept Miz off RAW after he returned over the weekend so it's possible they are waiting for Flair to arrive alongside him.
However, don't expect Flair to appear tonight as he's not currently backstage.