Not in the houses I've been looking at. Out of dozens I looked sty built within the last 10 years, only 1-2 had it. And the current owners weren't using it.
AFAICT, They're built with the presumption of wifi.
That's weird. It's not expensive to wire houses, and you can't get gigabit fibre speeds with ethernet. You certainly couldn't get anywhere near it 5-10 years ago, but gigabit fibre was available then.
Not true in my mid-sized city in the Pacific Northwest.