Regarding Tracking Airtags…
There have been a few questions of tracking Airtags. I have read some of the technical details about how Airtags work in several articles and I do not think it will be possible to track them. From what I have read, they use a Low Energy Bluetooth to broadcast their signal to broadcast their signal range is about 300-400m. More importantly, they are not located by iCloud, that is, they do not have wifi or cell service so iCloud does not locate them so it does not have their GPS location. This means they can not be tracked like an iPhone, iPad or watch.
At some time, I will get one and see if it can be used for detecting when a phone enters a zone. I suspect that will require an update to the iOS App to detect that and fire off the appropriate triggers but do k=not know at this time.