SPX is now in a very good place.

NOT ADVICE. DYOR.
Mark all points where signal line crosses from 0< to >0 (orange bar)
Then edit as follows. Pick points where Histogram (green bars) prior to crossover follows same movements + & - as BB%B (range = white box).
Then mark first point where histogram and BB%B go in opposite directions (white bar) following crossover (range = yellow box)

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Only problem is that a previous study of mine below did not complete within the required 6 weeks
A or B ?