The Promised Day, Fullmetal Alchemist Wiki

The Promised Day refers to the coming time of the long-awaited culmination of Father's four-hundred year plan involving Amestris, the Human Sacrifices, the Philosopher's Stone and the Nationwide Transmutation Circle. It was first mentioned by Father during his first appearance in the manga as a toast to his faithful children before quaffing Greed's Philosopher Stone heart back into himself and has since been mentioned sparingly and with few details. It appears, due to his excitement regarding it

In Fullmetal Alchemist Brotherhood why did Ed, Al, Mustang, etc, wait for the promised day before they attacked the capital? - Quora

the promised day.

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Chapter 83: The Promised Day, Fullmetal Alchemist Wiki