It's the latest version of Confluence that Atlassian have released to Cloud, always. You can see the exact version at the bottom of the page.
If you have no permissions for that page, then you are not an admin for the installation. You'll need to talk to your admins to get access.
Ah, I hadn't looked recently. I thought standard admins (above space admins, but below system admin) could see the system information page in Confluence Cloud.
I'm not sure the version actually matters that much - it's Cloud, you don't get any choice about the version (it's always "latest") and the Cloud docs should match it. Why are you asking?
he want's to go to personal instance and move data from cloud instance to personal.
for this operation you need to know version for to be sure your backup will be imported to another private instance.
Actually, the version still doesn't matter - Cloud is always the very latest version. So when you get to step 2 in https://confluence.atlassian.com/confcloud/migrate-from-confluence-cloud-to-server-724765578.html you need to grab the latest version from there too.
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