I got a 2019 Dell Precision 5540 with an UHD OLED, 3.840 x 2.160 and have 100% DCI-P3. And i think many other OLED Screens have it too.

When i configured the Laptop i could choose from these options:

FHD IGZO4, 1.920 x 1.080, 100% sRGB

UHD IGZO4, 3.840 x 2.160, 100% AdobeRGB Touch

UHD OLED, 3.840 x 2.160, 100% DCI-P3