To check the Approval History in draft report section, click on the Approval History option from the menu. 

The Status of the report in the Item History changes to from Draft to In Progress (in the case of User as Approver).

If the workflow is in progress, the following screen will be displayed. If the workflow has been cancelled, Declined, Pending Exception or approved clicking on the drop down will allow you to see the history of each workflow.

Note: If the workflow has been run several times on a particular report, the drop-down box menus above will display multiple history entries.