Cloud Scheduler publishes logs at the start of each execution and the end of each execution. Looking at your job's logs is a great way to look up actual job execution times and to check job configuration.
To view logs:
Visit the Cloud Scheduler page in the Google Cloud Platform Console:
Locate the desired job and click the View link under the Logs column. This takes you to the Stackdriver logs page.
View the logs detail. You should see output similar to the following: