Maybe they have harvested, but how do vinyards do after flooding?
Harvest is August-October, depending on varietal and ripeness. The vines are dormant, and as long as the water is not swift and ripping them or the trellis system out of the ground, they'll do ok. Obviously, it is difficult to prune vines if they're under water.
The vines are dormant right now. Harvest was weeks ago.
Some local messes may require replanting, but mostly the vines will be fine. Flooding is a frequent occurence in that area.
Some houses and other buildings have been damaged or lost, though. Always sad to see.
If they've been harvested, they're heading toward dormancy. Plus, the better vines are usually located on a slope -- above the flood plain and well-drained.
Probably no significant damage to the vines, themselves...unless they're submerged for over 36 hours.
At that, the vineyard owners will probably be working to get the fields drained and a.) any excess silt removed from around the roots and b.) any roots uncovered by erosion re-covered as soon as possible.
While some vineyards might experience severe damage, the situation overall could probably be characterized as minor damages to the viniculture. I'd be more concerned about serious damage to the wine production and storage facilities themselves, if they're located in the flood plain.
I wouldn't worry about the vines. I would worry about big dried-out weeds next summer when wildfire season starts again. Those folks in the midwest are going to get a bunch of rain or snow in a day or two.