It’s something my side of the family have never done for 3 generations to my knowledge although my wife’s (Catholic) family used to do so until she was around 12.
Grace or giving thanks is still apart of meals for us. It doesn’t have to be to a deity but it can be, I’m grateful that I have the ability to buy it, live in a part of the world with food abundance , and have the time to make and prepare the meals we eat.
Nope not ever sat a table with family in my 60 plus years and thanked anyone for the food other than those who cooked it, but then we were never religious