Upgrading from 2.0 to 30.

Hello fellow Opigno aficionado's. We are needing to upgrade from 2.0 to 3.0 and have been reading the instruction on drupal.org. it says: In composer.json file, add all content from Opigno 3.x composer file available at https://bitbucket.org/opigno/opigno-composer/src/3.0.0/composer.json delete composer.lock file run: composer install My question is, do we do this on the current drupal 8 codebase or should we first upgrade drupal to D9 and then perform the above?