So far, so good - we're right on track. We're setting up beautifully for a great low risk entry: on the pullback from the current rally (blue wave 1) peak - whenever/wherever the current rally stops. First resistance to end the current rally is at 685.
One thing we have to watch out for is a forceful break of resistance, and thus a higher wave 1. In this case, wave 2 (and the buy zone) would need to be adjusted higher.
....and in case of a runaway train - which could happen at any minute at this point - chasing would not be the worst thing you could do, depending on how far away it gets from you.