Samsung is set to release the Galaxy Note 20 and Galaxy Note 20 Ultra at the upcoming Galaxy Unpacked event on August 5, but in the meantime, you can download the official Galaxy Note 20 wallpaper in original quality and install it on your desktop. All the images you see below are available at this link.
Keep in mind that so far only one of the images has a resolution of 2467 x 1109. The other four that you will find in the archive have a lower resolution, although this will be sufficient for most users.
The colors used by this wallpaper are in line with the Mystic colors that Samsung created for the upcoming Galaxy Note 20 series. They include shades of bronze, blue and green.