My opinion on this is that we should not force other people to work on Sundays which is what we do when we patronize stores and eateries on a Sunday.
I think that we should not work on Sunday unless one works in a necessary profession like a doctor or a nurse or a policeman or fireman.
I don't think we are guilty of sin if we are forced by a wicked employer to work on Sunday and we need to work or else we won't have the means of supporting our families.
I just worked today. Of course, I work for a newspaper which is sort of an essential service (Although, I know the Munich newspaper, which is a very large national paper of high quality does not publish on a Sunday.)
I think the state should do more to limit Sunday work but, in America, we're not likely to see that happen.
To answer your question. I'd say don't do it. Don't put any more money into the pockets of businesses that are open on Sunday.
If the restaurant Chik fil a (sic) can get by without opening on Sunday, then it is n't necessary.