The signal must be confirmed by 11:00 ET. The signal candle's close is what counts: a 5-minute candle opening at 10:55 and closing at 11:00 is the last one that can enter. After 11:00 the day is a pass, no matter what happens later. The first hour and a half is the strategy's whole world.
For education only. Nothing here is financial advice, and trading involves risk.