If he nabs the Libertarian Party line, he could hit 2-3% of the vote. As an Indie, he won't hit 1%.
His performance would largely depend on whether Cruz is cancer among moderate conservatives or not. If Cruz isn't, he's fine, but if he is, a showing of 15-30% of the vote is possible.
I want this scenario to happen both because it would make a Dem pickup possible and because I have not seen the live results of a genuine three way race (I was hoping with McMullin, but that fell through) anywhere and think it would be really cool.