MES1! Likely Retracement Ahead Based on RSI and MACD & Timing

SPX has been in a tight range, grinding higher slightly every day. Momentum indicators have signaled a downturn as well as the divergence throughout this 40-day long rally. The targeted retracement is 50% Fib by mid-Jan of 2021. Levels are 3591,and then 3515 (50% Fib)