I used to do this but found every now and again I'd get multi-minute long delays before gmail picked it up. I've since moved to paying for Google Workspace to host my email (eventually hoping I'll move to something cheaper).

The goal is to get my personal domain to be my email domain for exactly this reason.

For my soon-to-be-born son, I'm registering him a personal domain immediately, and I'll turn it over to him when he's old enough to have email - save him some trouble.