They upgraded the projections during the bug scene and turntable, added new lighting to the launch, and repaired the AAs. But the majority of the work was a total brain transplant, from the automatic gates to the last break run. Computers, sensors, and the launch were replaced and now they're still ironing out programming bugs.
In order not to be seen as moving the goal posts I'll say that they were likely aiming for completing this by Labor Day weekend or sooner. So if this isn't ready by HHN (which is Labor Day weekend oh my god it's so soon) then I think they'd miss their "goal". And if they miss ACTUAL late summer (late sept) then I'd say it's a debacle.