Is there a Pulumi recommend pattern/template for using the Kubernetes provider to deploy content to a Private GKE cluster? Any thoughts or best practices for Pulumi based solutions would be awesome. I am specifically planning to use Pulumi to bring up the private cluster and deploy Argo which will then handle all further K8's deployments.. Thanks.

the private cluster part is a networking problem. You’ll need a VPN of some description. I have used tailscale for this previously https://github.com/lbrlabs/pulumi-tailscale-bastion

Yeah; Cheers that is as I expected. Thanks so much.

https://cloud.google.com/architecture/creating-kubernetes-engine-private-clusters-with-net-proxies should help you.