My build is listed on my profile. Here is my experience of this patch:
1) First, I created USB installer for High Sierra. Just in case, update screws up, I can use installer and restore the machine from Time Machine backup
2) However, the USB would not boot the machine and would always crash. I have two monitors connected to GeForce GT 740, and integrated graphics is not being used.
3) I disconnteced both monitors, and conncted one monitor to the integrated display, but machine would still crash when I tried to boot using USB. I even tried updating drivers using clover on USB, but no luck.
4) Finally, I removed the NVidia card from the machine, and voila the machine boots with USB.
5) With that comfort level, I booted the machine again from SSD, and went ahead with the upgrade. The upgrade went very smooth, with no errors.
6) No issues with sound and it kept working.
7) After reboot, I had to install updated NVidia web drivers.
8) Reinserted NVidia card and put the machine back in original hardware config.
Moral of the story, NVidia card was causing the issue. Minus that card, upgrade works as good as native Mac.
Hope this information is useful for fine folks on this forum.