Edit: as of April 05 this feature is available for all users! 

As per the roadmap we shared earlier this year, we will be rolling out scheduling functionality in Campaigns during April to all users.

You will be able to create Campaigns and schedule them to be sent at any time and date in the future. No need to be behind your desk to run your Campaigns. 

Take a look here: 

Let us know in the comments if you have any questions!