https://www.cnet.com/news/black-friday-2018-sales-starting-earlier-than-ever-at-best-buy-and-walmart-1/

Walmart is open all day Thanksgiving and will kick off its Black Friday deals on Thursday at 6 p.m. local time --two hours earlier than last year. Free coffee and Christmas cookies will be available to the brave souls who show up -- though most of Walmart's Black Friday deals will come online the evening before, at 10 p.m. ET on Wednesday, Nov. 21. 

First published Nov. 8.Update, Nov. 8: Adds corrected information about Walmart's store hours on Nov. 21 and 22.