I'm visiting mid July and I'm thinking this is unlikely to be open by then.
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Honestly, now that it's Vertical, I would bet they have the full circuit put together in a couple weeks. The coaster is pretty compact and not too complicated.
So being opened sometime in July, I would say Friday July 11th, isn't completely out of the realm of possibilty...
Yes, I know it's Six Flags, but they sure know how to rush these things when they need them, especially because their installations are always so "bare bones" for lack of a better word.