This is an area where we’ve been told it will be eventually improvements, but right now what SmartThings offers is really minimal. You can start the utility from the mobile app, but you have to go into the logs to actually see the results. Which again is way more work than it should be.
If everything runs great, all you will see is a message saying that the repair completed.
If there are any problems, there are additional error messages you might see in the logs.
The following FAQ tells you how to look at the logs:
And this thread discusses some of the error messages you might see.
I’m sorry there’s not a better answer on this point, it’s just an area where there’s room for a lot of improvement.