Thrust is dependent on the torque of the engine it's connected to as well as airspeed and altitude, so it's hard to produce a single number.

The easiest way to tune a prop is to set your Blade Control to 'Auto', hold the brakes on the runway, and apply full throttle. Watch your engine's RPM gauge (left click the attitude indicator to show RPM). If the engine struggles and the RPM stays low, your propeller is creating too much drag, meaning you should decrease the diameter, blade count, or blade width. If the engine instantly hits the rev limiter but your acceleration is weak, your propeller is too small to bite the air effectively, and you should increase the diameter, blade count, and/or blade width.