Images taken as HEIF present as JPG in Image Capture

Brand new iPhone X,

Camera set to HEIF for photos, yet connecting to my Mac and using Image Capture to transfer shows them all as JPGs. (no matter what transfer setting in Photos>Settings) Yes, I'm on High Sierra.

Plugging the iPhone into a Windows computer confirms they are all HEIF format images.

How do I use my Mac to get HEIF images off my iPhone? My old workflow included Image Capture on the Mac, but that seems broken. Did Apple abandon it?

Any help appreciated!