Airliners usually have to be fully configured for landing and not deviating from the glide slope or localizer at 1000 ft, or have to go around.
A typical flap setting for the a320neo would be flaps 1 and set speed to 180 kt before turning to intercept the localizer, set flaps 2 and speed 160 kts at 2500 ft, then full flaps, gear down and set the autothrottle to managed speed (or the apporach speed you want) high enough so that youre established and configured by 1000 ft.