Currently there is only one vivo phone with a Snapdragon 845 chipset the NEX S. There just might be a second phone on the way, though Geekbench 4 doesnt give enough details to tell for sure.
A vivo 1805 was benchmarked with Qualcomms top chipset. It ran Android 8.1 and packed 8 GB of RAM. Theres a few megs of difference between the NEX S and the 1805, but again thats not enough to be certain that these are different devices.
Looking at vivos lineup, it can definitely use a few more Snapdragon 845 entries. There are plenty of phones with the Snapdragon 660 like the Z1, V9 6GB, X21 and its UD version and others. So the premium mid-range segment is well covered, but another flagship would be nice.