Redfish API instance for Processor Metrics instancde

I have a r640 and r650 with updated firmware. iDRAC is at 7.00.00.00. I am trying to retrieve CPU utilization. I found the ProcessorMetrics instance here: https://developer.dell.com/apis/2978/versions/7.xx/openapi.yaml/paths/~1redfish~1v1~1Systems~1%7BComputerSystemId%7D~1Processors~1%7BProcessorId%7D~1ProcessorMetrics/get

Looks like it would have exactly what I am looking for, but it doesn't appear to exist on either server. Postman is returning "