The June update for Adobe Photoshop Lightroom Classic finally adds computer liveview display while tethering for Nikon cameras. While Adobe lists just the D850, D500 and Z6 and Z7 as supported for this feature, the Mark II versions of the mirrorless cameras also work, according to forum dwellers who have tested the new update.
Adobe may not officially distinguish between the Mark I and Mark II bodies for the purposes of Lightroom support, as the updates were not very significant.
Alternative: Nikon’s Own Editing Software (just kidding)
Nikon has its own imaging editing software, enthusiastically ignored by the experienced.