This features is available on the campaigns tab. If you use the "Filter emails by send date" search feature and choose a date range in the future, it will show you the scheduled emails.
Click Here for an article that shows how to use the "Search for Email Campaigns by Send Date" feature.
There is also a calendar view available on the Campaign Tab and emails that are scheduled will show there as well.
Click Here for an article that shows how to use the "Marketing Calendar" feature.