How to list all grants per user/role on PostgreSQL

I’ve run these statements on Postgres CLI (I’m using PostgreSQL v13.1):

CREATE ROLE blog_user; GRANT blog_user TO current_user; 

And I created a function

CREATE FUNCTION SIGNUP(username TEXT, email TEXT, password TEXT) RETURNS jwt_token AS $  $   DECLARE   token_information jwt_token; BEGIN .... END; $  $   LANGUAGE PLPGSQL VOLATILE SECURITY DEFINER; 

Finally I granted a permission:

GRANT EXECUTE ON FUNCTION SIGNUP(username TEXT, email TEXT, password TEXT) TO anonymous; 

I wish to list all grants per user/role in my schema/database. \du and \du+ show basic information, which does not contain info about the grant (execute on function) made recently.