This is the latest list of 20.04 devices that are available in the hidden channel of the UBports installer:
Xiaomi Poco M3 (citrus)
OnePlus 5 (Cheeseburger).
OnePlus 5T (Dumpling)
OnePlus 6 (enchilada)
Xiaomi Mi A2 (jasmine_sprout)
Xiaomi Redmi Note 7 (lavender)
Google Pixel 3a (sargo)
Volla Phone (yggdrasil)
Volla Phone X (yggdrasilx)
Sony Xperia X (suzu)
Fairphone 4 (soon - blocked by OTA 24 freeze)
Volla 22 (soon - blocked by OTA 24 freeze).
More info on Focal will follow shortly. Thanks to the Dev team for above list and continuing work on Focal.
Edit on 08/11/22: Forgot two devices people might be intrested in. They are now added.