The Time of the Day condition allows you to limit the time of day at which a campaign can display.
This condition would work well on a campaign that was promoting your next day delivery cut-off times.
To set your conditions, click Add Condition in the Finalise your campaign section of setting up your campaign. From here, click the green plus button next to the condition you would like to use.
Here you can set a show after time and a show before time.