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https://maps.tableausoftware.com:443 or just maps.tableausoftware.com:443 would work.
You can test connectivity by using the following steps from this article:
Reference : Configuring Proxies for Tableau Server
Step 5: Test the proxy configuration
To test the new configurations, while still logged on as the Run As User on the Tableau Server computer, open a web browser and test the following Tableau mapping URL:
This is the URL : Miami and Havana (blue water)
If the configuration is working, you see a map of Miami and Havana. This indicates that the Tableau Server computer is able to access the internet through the proxy.