Time format for trigger at the top of the hour

Configuration
1

How do I format this time function for this trigger to fire at the top of the hour every hour? I’ve been searching and trying but no joy so far. Since it is an hourly event, it’s taking a bunch of time to test, so hopefully someone can fill me in.
Here is my automation code that I am working with. How do I format instead of the 00:00:00? Thank You!

alias: Reset running total at top of the hour
triggers:
  - at: "00:00:00"
    trigger: time
actions:
  - target:
      entity_id: input_number.running_total
    data:
      value: 0
    action: input_number.set_value
2 
triggers:
  - trigger: time_pattern
    hours: '/1'
3

Thank You very Much!!!

4

That will trigger every second of every hour. You actually want:

triggers:
  - trigger: time_pattern
    minutes: 0
    seconds: 0