Of course! This is great for planning projects ahead of time and lets you set it and forget it!
You can schedule the time and day of your send from within the add recipients page. Just click on the little clock icon:
Next click on the drop down and select schedule send:
Finally, enter in the date and time you would like to schedule your delivery:
Don’t forget to click the Schedule Envelopes button in the top right of the screen to finalize the scheduled send.