You didn’t have to do this. Any new and existing keys have the policies that you get with the Patreon tier you pledged with.
As for benefits, you will get them automatically and will be able to use them yourself. You don’t perse get anything, you will have to implement it yourself.
- Coloring your server name using https://forum.cfx.re/t/chat-formatting-colors-bold-underline/67641.
- Using OneSync https://forum.cfx.re/t/the-onesync-eap-and-you/165931
- Streaming custom clothing https://forum.cfx.re/t/how-to-stream-custom-clothes/167805
There may be some other benefits, but these three are the ones you’re most likely to use.