SQL> create or replace package pkg1 is
  2  function f1 return number;
  3  end;
  4  /

Package created.

SQL> create or replace package body pkg1 is
  2  function f1 return number as begin return 1; end;
  3  end;
  4  /

Package body created.

SQL> grant all on pkg1 to public;

Grant succeeded.

SQL> -- all_tab_privs_made has objects - not just tables
SQL> select table_name, grantor, privilege from all_tab_privs_made
  2  where table_name = 'PKG1';

TABLE_NAME                     GRANTOR                        PRIVILEGE
------------------------------ ------------------------------ ----------
PKG1                           TATST                          EXECUTE
PKG1                           TATST                          DEBUG