1.   Setup the delivery dates plugin for all products ?
Ans:  To configure the the delivery date plugin for all products you need to go into your Admin Panel > Delivery Dates Dashboards > You can enable and disable delivery dates and days

2.   Setup the delivery dates plugin for Single Products ?
Ans:  To configure the the delivery date plugin for all products you need to go into your product editor > Delivery date metabox > Click on override global setting and select days or dates.

3.   Does plugin require any special Permission?
Ans:  No.

4.   Does plugin depend on any another plugin?
Ans:  Yes, Woocommerce plugin is required