It's also on your system information page, and you can rely on it being "the latest" - Atlassian roll out the latest version to Cloud all the time, it's one of the selling points.
A instance I have access to is at 6.5-OD-08-001. This was released July 5th through July 11th.
You can find this information and more under What's New in JIRA Cloud documentation.
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