noun
delivery day
Refers to the scheduled day on which a package, mail, or goods are delivered.
配達日は明日です。
The delivery day is tomorrow.
配達日を変更できますか？
Can I change the delivery day?
配送日 is a near-synonym also meaning 'delivery day', but 配達日 is more common for home delivery of packages.
Compound of 配達 (delivery) and 日 (day).