By 9:35 AM EST, there is about a 20% chance that the high OR/AND low of the day in the S&P500 has been made.
By 10:05 AM EST, there is about a 55% chance that the high OR/AND low of the day in the S&P500 has been made.
By 11:00 AM EST, there is about a 90% chance that the high OR/AND low of the day in the S&P500 has been made.