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By dynamic provisioner do you mean using the <https://www.pulumi.com/registry/packages/command/|pulumi command> package or a python <https://www.pulumi.com/docs/intro/concepts/resources/dynamic-providers/|dynamic provider>?

I realised after I posted I meant command and I think the answer is no

Would I have to rely on GCP logging of the instance?

The command package will wait until your script has finished running. If you need to ensure that the resource is really created and available you need to add that wait logic to your script.