You can use funnels to schedule tours to show after a specific date. This way you can prepare tours beforehand for a new release of your software, while ensuring the tours are only shown to users after the release date.
In the HelpHero Editor edit your tour and add a new funnel step after the first URL match.
This ensures that this tour will only run if the current date on the users browser is greater than 21st of December 2050.