Where to get the GraphQL schema for my DB?

I'm trying to set up supabase using relay in my NextJS project, but I need to download the schema from my DB into my project, and can't really understand how to do this?

I'm following this tuturial:
https://supabase.github.io/pg_graphql/usage_with_relay/

Here is the project I'm trying to implement it in, it uses a GitHub GraphQL endpoint right now, but I want to port it to use my supabase DB...
https://github.com/minifisk/GraphQLRelayNextJS/tree/supabase

A PostgreSQL extension adding GraphQL support

GitHub

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