An on-prem "production ready" k8s cluster in under a day? What kind of businesses are you setting this up for? Are these all greenfield projects? I'm sorry, but I find it hard to believe that.
We run on-prem k8s, on bare metal and VMs. Integration with existing storage (we use NetApp Solidfire and NFS), load balancers, firewalls, backup strategy, DR, etc. takes weeks, if not months of work. But we may disagree on what "production ready" means.