Yes, you can check your CGM information on your wrist! The Dexcom G5 Mobile App supports Apple Watch and can be used to discreetly view your glucose reading, trend arrow, and trend graph. Use the digital crown to scroll the trend graph view between 1, 3, or 6 hours of data.You can also view your number and arrow as a complication on your watch face. You can choose from four complication styles depending on your preferred watch face.

https://www.dexcom.com/can-i-view-my-dexcom-g5-mobile-cgm-data-apple-watch