Samsung has begun seeding its One UI 7 update for the Galaxy A54. The update is now available for Galaxy A54 users in South Korea bearing the A546SKSU9DYD7 identifier. It comes in at 3.5GB and comes with the April security patch.
One UI 7 update screen for Galaxy A54
The update should gradually spread to more regions in the coming weeks. You can consult this roadmap for more details on which devices are getting the update this month and the ones after that.