Jet Engine Thrust Question

How does rated thrust for a jet engine translate to actual power? I guess my
question is, for example, a Cessna Mustang has two engines that produce
1,460 lbs of thrust each (x 2) so the total is 2920 lbs of thrust for the
two engines. The takeoff weight for the Mustang is listed as 8,645 lbs. so
the engines are only putting out a 1/4 of the total aircrafts weights. So do
they rate thrust different to the actual weight that the engines can fly? Is
the reason that is does only produce 2920 lbs. of thrust but the wing is
what actually makes the plane fly so the thrust doesn't need to equal
weight?