The P1's (down phases) should kick in during June.
The current SPX Weekly P2 cycle (up phase) is now in it's 29th week, which is now extending it's extended phase.
Looking at my current SPX Cycles Chart. We could see a massive downside move in the near future if the SPX drops below the 2384 level which could put the Weekly in P1 territory. This week we have two 60 min P1 phases (60-1 & 60-E-1) that could propel the SPX to that level, the Daily currently has 2 overdue P1's (D-1 & D-SC-1) and the other two Daily P1's (D-S-1 & D-E-1) come due in June.
At the Weekly level the W-S-1 is overdue with a current projected low range of 2329.60 to 2292.05. That's where I believe we are headed. That would take the SPX Monthly down to it's UTL which is currently at 2297.36. Then I would say July/August the Bull rally continues to the end of the year and that would likely get your 2600 level.