https://wccftech.com/surface-laptop-3-with-intel-gets-new-firmware-update-14-310-139-0/

Along with Surface Pro X, Microsoft's Surface Laptop 3 is also receiving fresh new firmware updates. These updates are available for devices with the Intel processor running  Windows 10 May 2019 Update, version 1903 or greater. Updates for Surface Laptop 3 with Intel processor follow the release of firmware updates earlier in the month that were delivered to devices with AMD chip.

If you aren't sure about the processor in your device, you can confirm through Settings > System > About.