I'm trying to use the Domain Mapping plugin for the first

I'm trying to use the Domain Mapping plugin for the first time.

I'm assuming, based on the error message, I need to wait until DNS propagates as the plugin does a real time lookup for the A Record.

Is that correct? Is there a way to remove that real time check, so that I can set up the mapping before DNS propagates, so there's no downtime for sites that are migrating?