not very likely. Has to be string of unlikelys. He has to be standing at his open window. Your open window directly below his. There has to be no wind. He has to aim his sneeze to project in your window's direction. It has to land on a surface that's virus friendly which is unlikely given the open window and sun exposure. And you have to go and touch/lick/smell the virus from that surface while it's still viable. Or breathe in deep deep while he sneezing.
KNN when the day comes whether open window is safe anot is doomsday liao KNN means even you close all window but you still need to order food either online or on site but the food will no longer be safe to eat KNN