Latest Headless Chrome 72 user agents:

User Agent Platform Device
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/72.0.3626.96 Safari/537.36 Windows 10 Unknown
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/72.0.3626.96 Safari/537.36 SQWatcher/201906 (sqcompliance.com/sqwatcher.html) Mac 10 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/72.0.3626.109 Safari/537.36 GNU/Linux Unknown