This[0] is the one I have. It is explicitly listed as thunderbolt 4, but, unfortunately, i dont't know if it supports thunderbolt 3. My hunch is that it does, but something wont work perfectly. Most likely, the usb hub won't, and the refresh rate will drop from 72hz to 60hz. Which is imo not a big deal whatsoever, as the main functionality that I personally value is still there.

LG also seems to have a thunderbolt 3 ultrawide monitor[1] that is very similar, and I recommend checking that one out. Only heard good things about it, and it is pretty much the predecessor of the one I linked in the beginning.

0. https://www.lg.com/us/monitors/lg-40wp95c-w

1. https://www.lg.com/us/monitors/lg-34WK95U-W-ultrawide-monito...