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 How can you check this?  I.e. how does a pleb know if their relays support NIP-09 or not?  (PSA) 
 It's different for different clients. I provided a method above for garnet and Amethyst. 
 You can check on https//nostr.watch

On the details page for a relay, it lists the NIPs. Link and screenshot provided. 

https://nostr.watch/relay/nostr.thesamecat.io
https://m.primal.net/Jwem.jpg 
 That's self-reporting, tho.