The Scripting page shows you the execution status of Device Scripts.

In the Job Status table you will see:
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The Script name
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Its overall status - one of new, running, done, or failed
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Report Status
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Date and time the script was started
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Data and time the most recent update was received from any device
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Actions - a trash can so you can delete a completed Job, or a square that lets you Cancel a Job which is still running.
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The number of Devices in the Job
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The number of "Failure" messages received

It is important to understand that on the average it takes 3 minutes for Job Status to update. So your script may actually complete and update the Status cells before the Job Status catches up. It should respond and update within 3 to 4 minutes.