Here is advice for grape growers in North Carolina from NCSU Extension. Short answer: if your grapes are near harvest, bring them in now! Note that the discussion is good but that the information is already somewhat dated with a western trend in the projected path which makes northern Georgia a more likely target for heavier rain and strong winds than previously expected. You can read it at https://grapes.ces.ncsu.edu/2018/09/hurricane-florence-warning/. Get updated storm information at https://www.nhc.noaa.gov/.