Sensor to know when HA is fully Up/Rebooted

I like the new features that give you access to the front end as the systems comes up and now that I moved to OpenZwave the zwave = ready is not available for me to use as a delay to trigger some node red automation on reboot. Is there a sensor in HA that tells me when all integration/devices are full loaded.

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There is the homeassistant/start event, but I am not sure exactly when it triggers.