The Lyric app itself can determine when you are home or not. In the Lyric app, you turn on geofencing and it shows you a radius around your location that you can adjust. Once the device with the app installed leaves that area, the thermostat goes into “away” mode. Or, you can just write a schedule for when you are home or away.
I’m not sure how it would work if the Lyric app was installed onto a tablet or other device that you leave at home. I tried to install the Lyric app onto an Android tablet, and the Google Play store tells me it is not compatible with my device, although it exceeds the requirements listed on the Honeywell site.
I did look into IFTTT and it allows an applet to be written starting with the Smartthings presence sensor (probably your phone, or one of those arrival sensors). If presence is no no longer detected, you can only do two things with the Lyric. 1. Set the temp to a specific degree (which you can speak if using Alexa or Google Home). 2. Toggle the fan mode from auto to on or back again. So, there are not many options on the Honeywell side.