The most conservative target at 398 SPY / 3995 SPX has been briefly hit intraday. But SPY / SPX is right at resistance in the very short-term. Tomorrow is FOMC and VIX-expiration. Many savvy traders go completely flat until after the FOMC rate decision. That seems wise. Price could whipsaw dramatically higher and lower (as it has at previous FOMC pressers in the past year), stopping out leveraged bulls and leveraged bears trying to gamble on the decision.
Broader picture comments on this short-term SPX view:
The idea is succeeding to some extent along the hypothesized path. But it has not been easy for traders—and that is the nature of choppy, whipsawing action: it's highly uncertain and unpredictable. In fact, this idea was even "stopped / closed" because of SPX's sharp move below 3900 on bank failures (SIVB, SVB, SI, Signature) and bank stresses (CS, FRC). 3900 had appeared to be a critical level that might hold in the short term, but it didn't, and price moved into the 3800-50 range in early March, albeit briefly.
Some think that "flexibility" means weakness and lack of confidence. Reading about market wizards teaches one otherwise. It's absolutely vital to stop out a bullish idea like this one when an invalidation levels (and one should definitely always have one) are broken to the downside. This keeps losses small. And avoids cutting losses at 3850, or 3800 or even lower. But many of the great traders also are not afraid to reenter a trade when the key invalidation level is reclaimed and the idea is validated once again.