How do I know it is actually working?
The Dashboard answers this at the top. Green means pages are being served before WordPress loads.
To check a specific page, put its address into Diagnostics. It fetches the page twice and tells you what the server did. The second fetch saying HIT is the proof.
You can also look at any page's source while signed in: a page that was built rather than served carries a comment at the bottom saying so.
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