You can check the status of all your Usage Rights requests in your Content view. Here, you'll find several ways to do this.

As soon as you request Usage Rights on an asset, that asset will display a tag with the up-to-date status of your request:

You can also apply filters at the top of your library to isolate the Usage Rights requests that are still pending, have been approved, or have been declined. If you want to see all the assets you’ve ever requested Usage Rights for simultaneously, select all three filter options (Pending, Approved, and Declined).

Also, here's How to see all content without Usage Rights. This article will help you see all the content you have not requested for usage rights yet.