Yesterday night my A55 got Android 15 with OneUI 7 update of 2.8GB in size and came with May security patch.
Make sure to update in AC room (preferably showing the metal rim before AC) to avoid getting any green/pink/white lines in display. After update, do not forget to disable Bixby, remove Gemini from press & hold power button, Change to combined Notification and update all "Good Lock" modules in Galaxy Store.