showtime

/SH OW1 T AY0 M/
noun
  1. 1

    The time at which an entertainment event is set to begin.

  2. 2

    The time for action.

interjection
  1. 1

    A declaration that something is about to happen, particularly that the person speaking is about to act.

Source: https://en.wiktionary.org/wiki/showtime