Hello @Heather1086,
I've noticed the same Read receipt message with my iPhone 7 too. It only pops up when I'm sending a picture/MMS message to a non-iPhone user.
I took a minute to review the options under Settings >> Messages and seems like the only Read Receipts option we get is for when an iPhone user sends a message. This makes me think this is an option set up on the receiver's end. Not yours. They could also have RCS messaging set up on their devices. As far as I know since this is still a fairly recent addition, it could also be another reason why you've just started receiving those messages now that you're with Rogers.
Hope this helps!
RogersZia