The same effect is shown above the cockpit canopy, where the upward bulge induces a venturi effect making the airflow supersonic. The resulting standing shock forms at that location. It is also somewhat visible on top of the wing (but perhaps only to the trained eye), whereas in contrast there is almost no visible shock along the underside of the plane.

Note that venturi effect doesn't contribute to lift. Lift is caused by wind pressure on the bottom of the wing which is inclined w.r.t. the airflow. The smooth bulge on top of the wing, what people call an "airfoil" simply maintains laminar airflow over the top and prevents flow separation & stall. It's mostly the air pressure on the bottom of the wing that generates lift.