A lot of counties and municipalities are pursuing grants for the federal dollars to expand broadband infrastructure, but that will take years to implement from application, review, awarding, and final build-out. Keep in mind that "broadband" may mean as slow as 25 Mb/s download speeds in some areas.
Many areas probably have fiber on the phone poles or in conduit covering long distances, but you will probably find very few service areas that provide fiber into the home. The fiber backbone does seem to greatly improve reliability over copper.
I would focus on areas you know have cable. If you can get cable, you can get at least 200 Mb/s. Surprisingly, when searching my parents' address in Polk County, Spectrum offers up to 1 Gb/s cable speeds, so things are definitely improving. If you can be within a few miles of a town and off of a sorta "main road" and still find your minimum acreage and be rural, you will likely have decent internet. If you're on a gravel road that's off a road that's off a road that's off a road, you'll never have good wired internet.
And if you have the money, the providers will run cable/fiber/whatever to your house. I heard of someone that was also in Polk that didn't have internet to their very, very expensive property. The phone or cable company said they'd run the line, but the cost was something in excess of $10k. They wrote them a check and now have internet.
NC OneMap (from the NC Center for Geographic Information and Analysis) offers some broadband mapping resources, particularly
this web map.
https://www.nconemap.gov/pages/broadband