Comcast internet, S24+, I thought the 6 year old PC would be the drag?

You have 2 bottlenecks, the speed of transfer between MMW PC and MMA device, and how fast the storage is. With upgrading wi-fi on the PC, you need to make sure that your home wi-fi can handle the faster connection, otherwise you need to upgrade it too.

Note that wired for the PC is the best.

The desktop PC is 6 years old. My S24+ phone probably has a much faster WiFi than the PC. Would it be worth it to add a thumb drive USB internet to it as a try to speed things up during a WiFi sync?

I have noticed that FLAC takes longer when doing a WiFi sync from MMA. I wanted to connect a wire [USB-C] cable and start the sync from my PC with MM5 installed. Could not figure it out. I just assumed the wired sync would be much faster.
EDIT: Oops. The USB-C cable got disconnected from the PC.