If you haven't tried Mac's Bar-B-Que, you'd better hurry. After 66 years, the Dallas staple is set to close. He will open Monday for regular business hours, 11 a.m. to 2:30 p.m. He said he will open Tuesday if he has enough supplies. Author: Morgan Young (WFAA) Updated: 10:29 PM CDT July 23, 2021 DALLAS — When Billy McDonald went to unlock the door of Mac's Bar-B-Que for its 11 a.m. opening time on Friday, he was met with more than a dozen faces. "I had 15 people waiting outside," McDonald said. "By the time I looked at the clock again, which was 11:15, they were all the way to the door and down around the corner to the next block.”