high time (noun)

1. The high time to decide on the color scheme for the living room is now, as the painters will start tomorrow.

2. It was high time for Jack to propose to his girlfriend, as they have been dating for years.

3. In many cultures, the high time to celebrate Christmas is during the midnight mass on December 24th.

4. As the superhero was fighting the villain, it was high time for her to unleash her ultimate power and save the day.