When a custom machineConfigPool is created and no node is associated with it, the mcp remains at 0% progress.

100%

1. Create a custom mcp:
~~~
cat << EOF | oc create -f -
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfigPool
metadata:
  name: custom
spec:
  machineConfigSelector:
    matchExpressions:
      - {key: machineconfiguration.openshift.io/role, operator: In, values: [worker,custom]}
  nodeSelector:
    matchLabels:
      node-role.kubernetes.io/custom: "" 
EOF
~~~

The mcp is visible from the from "Administrator view > Cluster Settings > Details" at 0% progress

It shouldn't be stuck at 0%