Some variation of that’s been around for a while. 15 years ago our local Safeway had Thanksgiving in a box, all the parts heat and serve. It’s been ramping up lately, probably because take and bake not quite restaurants have been on the rise (like Papa Murphy’s pizza), renewing interest in that market. Websites like Homechef do that one better, pick your menu for the week, get all the parts in the mail. There’s even one where you can get the equipment, I was jealous that didn’t exist when I was first establishing a home, great way to get kitchen utensils you need as you learn you need them.
These stores go beyond the fried chicken, pork chop and lasagna meal. They have many varieties of fish, steak, veal, chicken meals. In the upscale store they have Filet Mignon steaks already cooked. They must know they are going to sell them if they are confident enough to cook them in advance.