How to display custom notification or alert message on checkout pages?

Question

Since the Covid mutation has arrived at our warehouse location, I'm looking for a way to use a text banner or something similar to inform people about possible unscheduled delays in shipping orders.

For this, I am looking for the easiest way to display custom alert messages on the checkout and checkout/cart pages. Do you have any good ideas?

Answer 1

After some research, I decided to implement the notification banners with widgets and blocks.

How to do that is explained in How To Add Custom Notices to Page Top in Magento 2 by @prince-partel.