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DayOfDelivery = column name in ps_orders table.

If not exists, create IT.

ALTER TABLE ps_orders ADD DayOfDelivery date DEFAULT NULL;

https://devdocs.prestashop-project.org/8/development/components/grid/tutorials/modify-grid-in-module/

You obviously don't read the documentation and expect to be able to just copy the codes. That way you won't understand and you won't learn anything. Here is the documentation. I have already given more advice than is healthy and without a single like post. I have no more advice.

DayOfDelivery = column name in ps_orders table.

If not exists, create IT.

ALTER TABLE ps_orders ADD DayOfDelivery date DEFAULT NULL;

DayOfDelivery = column name in ps_orders table