In the TinyApp mobile app you're able to see a list of recipients and who have opened your News & Highlights message. The automatic read receipt is triggered when the parent opens the News & Highlights message.
How to see the list of recipients and who has opened the News & Highlights message?
open the TinyApp mobile app and sign in with your teacher account
Open the "Messages" tab
In the N&H message listing, tap and hold any of the messages for 3-4 seconds to open the recipient list view
In the view that opens, you are able to see who has sent the message, when the message was sent, a list of recipients and a checkmark icon next to the names indicating that at least one of the child's parents has opened the message