Does the 50/200 golden cross still work on US large caps?

We want to ride established uptrends in US large caps using the classic 50 over 200 day moving average crossover, often called the golden cross. Enter long the next open after the 50 day simple moving average closes above the 200 day simple moving average for the first time in 30 trading days. On entry, place a protective stop 1.2 ATR below the entry price using the 14 period ATR from the entry bar. Size the position so a stop-out loses exactly 1 percent of account equity. Round down to a whole number of shares. Exit at the next open the first time the 50 day simple moving average closes back below the 200 day simple moving average. If the position has been held for 200 trading days without resolving, exit at the next open as well. Long only. One open position per ticker at a time. No leverage and no pyramiding.