According to this [1,2,3] there are currently 99 747s in the air, a quick check [4,5,6,7] shows, that at least some are passenger planes.
[1] https://de.flightaware.com/live/aircrafttype/
[2] https://de.flightaware.com/live/aircrafttype/B744
[3] https://de.flightaware.com/live/aircrafttype/B748
[4] https://de.flightaware.com/live/flight/BAW117/history/202001...
[5] https://british-airways.flight-status.info/ba-117
[6] https://de.flightaware.com/live/flight/DLH462/history/202001...
[7] https://lufthansa.flight-status.info/lh-462