Adding Customer messages

I see the standard "Booking" email templates but wanted to add a "how is your stay so far" and "thanks for staying with us/leave a review" automated message. is there any way to do this in Owner Rez, to set them up to send at specific times during and after the customer stay?

Sure, that is a core purpose of OwnerRez.

https://www.ownerrez.com/support/articles/messaging-overview-video

https://www.ownerrez.com/support/articles/email-templates-and-triggers

https://www.ownerrez.com/support/articles/pre-arrival-email-templates-triggers-custom-fields