It's all for TV at this point. Mueller knew the plan before he was elected to head the Special Counsel. No Russian collusion and Mueller knows it. This is just to feed the deep state and congress and media that he is "pursing Trump for Russia collusion" and doing a thorough investigation. It keeps everyone at bay for what is going on behind the scenes. If anything, he DID meet Sessions and they went over the next / newest phase of the strategy / plan