How do I know if the virtual service I have applied has been reconciled by Istiod?

I am trying to use istioctl to see if my sidecar has been synced with istiod.

When looking at the the implementation of istioctl, it calles IstiodPortForwarding:15014/debug/config_dump?proxyID=$pod.$namespace and podPortForwarding:15000/config_dump then compare the results.

My question is that, how do I know if the envoy config ``IstiodPortForwarding:15014/debug/config_dump?proxyID=$pod.$namespace` gave me is from my latest virtual service/destination rule, not before the reconcile?

Or how do I know if Pilot has finished pushing?