Most civil turbo-fan engines have nozzles that expand the gas to less than the local speed of sound.
Typically at cruise it would be about 250-300 m/s for the fan nozzle and 300-400 m/s for the hot nozzle ; speed of sound goes up with sqrt(temperature) so the hot exhaust gases can expand to a higher velocity.
Trends are to lower velocities compensated with bigger areas, mostly for noise reduction purposes.