Has anyone tried to create guest Kubernetes cluster on harvester in air gapped mode ? I was following this https://docs.harvesterhci.io/v1.5/rancher/node/rke2-cluster but could not get much detailed information.

You need to fetch all the necessary bits to your repo and then point to that when Rancher provisions the cluster.

Could you please elaborate on what all are necessary bits ? Do I need to keep all the image of particular rke2 release in my private registry first ?Also I would like to have Suse SLES vms as my Os distro for the rke2 nodes

Yes