Once the parameters and execution files are ready, you can run/execute the test. Use the Run button in the RSAT tool to initiate an execution. Here is a visual of a configured RSAT tool that is ready to initiate a test run:

Upon the running of the test, RSAT will initiate a new Internet Explorer (IE) browser session, and using Selenium, would carry out the test as per the steps in the task recorder and the values in the parameter file:

Note the test result as Passed or Failed in RSAT:

Also, you can see the test execution details in DevOps as follows:

We believe that Microsoft will further strengthen this tool and that it will be able to run more and more scenarios in an automated way, with the ability to provide a data feed to run the text and capture the results in DevOps.