News I get is some big airlines performed all updates in an evening and are back to normal, but a small fraction of planes will take much longer time. I assume these are the oldest planes and they need specialised hardware for the update (e.g. floppy disks, emulators).
Schiphol handles a lot of those Airbus planes every day. From the moment I heard about this immediate requirement at roughly midnight UTC Friday/Saturday I followed all the flight departures for Saturday and only about 4 flights were cancelled.
I didn't bother to check what aircraft they were because 4 cancelled flights seems about normal on any given day for all I know. I checked several times throughout Saturday. Schiphol has many, many flights every day.