OS update through Katello

Problem: I would like to upgrade my existing rocky linux servers (for hosted ones not katello) from version 8.8 to rocky linux 9.5. But how can i acheive this through katello ?

Expected outcome: All server in the hosts section is updated to new rocky linux os versions

Foreman and Proxy versions: 3.13.0

Foreman and Proxy plugin versions:
foreman-tasks 10.0.1
foreman_remote_execution 14.0.2
katello 4.15.0

Distribution and version: EL9
Other relevant data:

Currently i have the packages for EL9 and also EL8 in the products list . How to upgrade from 8 to 9 here ??

Hi,
have you seen the Upgrading hosts to next major Enterprise Linux release section of the docs ?