1. Scroll down on the left navigation menu and click on Reports. Then click on Deal Reports block.
2. Click on the Smart View dropdown and then click on Sales Report - This Month (for this month's sales report) or any other Sales Report as per your requirement.
3. Once the Sales Report view is loaded click on Export icon on the right side and then click on any of the Export options available in the dropdown.

For deal to appear in the Sales Report it's status should be Delivered.