Also don't need to have clocks at all, which was an industrial-age invention. The concept of standardized time and hour-long timezones dates from the mid-1800s, and was a construct of the railways (which needed to publish schedules that'd be valid across long distances). Before then each village or region had its own time.
Do you think agriculture hasn't moved into a post-industrial age? Modern farms are tightly integrated into a global supply chain from imputs to product and definitely need to work on the same standardized schedule as the rest of the world.
https://www.thecanadianencyclopedia.ca/en/article/invention-...