Please share the dictionary tables to view the grants on objects, system and object privileges etc.
Different objects have a different set of privileges, and there is not a single view for then all. You can check the system catalogs [1] for a specific object and check its privileges as an aclitem[] [2], e.g. for relations you can check pg_class grants using a query like so:
select relname, (select rolname from pg_roles where oid = grantor) as grantor, (select rolname from pg_roles where oid = grantee) as grantee, privilege_type, is_grantable from (select relname, (aclexplode(relacl)).grantor, (aclexplode(relacl)).grantee, (aclexplode(relacl)).privilege_type, (aclexplode(relacl)).is_grantable from pg_class where relacl is not null) as pg_class_privs;