Hi @Tsering6
I'm also a newish host, so I'm sure there is better information from the others, but I found there is no notification system for check in unless the guest lets you know.
However, I use a smart lock system and assign a unique code to each guest, and I will get a notification on my phone when code has been used to unlock the door the first time. There is also the doorbell camera, so I know the guests have checked in, but that's about it.