This is a good question. I immediately thought of Dies Domini by St. John Paul II. Here is a clip from it that may help you:
67. Through Sunday rest, daily concerns and tasks can find their proper perspective: the material things about which we worry give way to spiritual values; in a moment of encounter and less pressured exchange, we see the true face of the people with whom we live. Even the beauties of nature — too often marred by the desire to exploit, which turns against man himself — can be rediscovered and enjoyed to the full. As the day on which man is at peace with God, with himself and with others, Sunday becomes a moment when people can look anew upon the wonders of nature, allowing themselves to be caught up in that marvellous and mysterious harmony which, in the words of Saint Ambrose, weds the many elements of the cosmos in a “bond of communion and peace” by “an inviolable law of concord and love”. (111) Men and women then come to a deeper sense, as the Apostle says, that “everything created by God is good and nothing is to be rejected if it is received with thanksgiving, for then it is consecrated by the word of God and prayer” (1 Tim 4:4-5). If after six days of work — reduced in fact to five for many people — people look for time to relax and to pay more attention to other aspects of their lives, this corresponds to an authentic need which is in full harmony with the vision of the Gospel message. Believers are therefore called to satisfy this need in a way consistent with the manifestation of their personal and community faith, as expressed in the celebration and sanctification of the Lord’s Day.
While the paragraph I cited doesn’t specifically answer your question, it should help you see the significance of the required rest you need on Sunday. I hope you read the whole thing. It will help you. Sunday is a Holy day, all day. I myself have had to go to the store on more than one occasion since becoming a Catholic on Sunday, but leaving it as a regular shopping day isn’t right. I follow the 2-hour rule when it comes to work on Sunday. If something has got to be done on Sunday, it cannot exceed this two hour limit. This doesn’t apply to those who have to work on Sunday by the nature of their jobs. It is how I was instructed to adjust my “woman’s work” in the home as a mom, etc. to the observance of Sunday’s holiness. I have more than one lazy bone, so leaving the dishes till Monday morning isn’t a big deal. I try to do everything I need to on Saturday and do not deliberately leave any chores for Sunday. Before becoming a Catholic, some chores were reserved for Sundays, like shopping, because no one was around and Walmart was emptier then and I could get in and get out quickly. I stopped that when I became a Catholic as well as laundry day, which was also Sunday. So was making a big “Sunday dinner” which always called for more than two hours work in the kitchen. I don’t fool around with this any more. It caused more than one mortal sin in my life. Yeah. I admit it. I’m no saint but am getting better at things. It called for adjustments, but I’m glad I made them. Shopping to me, is one of those chores that should be done on days other than Sunday and the temptation is to go shopping socially with Mom and Sis and a few friends, etc. during the holiday season. This is a nice bonding experience, but it shouldn’t happen on Sunday because you’ll very easily slip out of the two hour zone of venial sin and fall rapidly into mortal territory. BTW, it is a mortal sin to work on Sunday in excess and would need to be Confessed to. Same thing for Holy days of obligation. No work those days either if it can be avoided. So there ya are. I hope this helps.