https://wccftech.com/sony-ps5-1440p-support-update/

PS5 1440p resolution support might be added if there’s enough demand for it, Sony has confirmed.

Unlike the Xbox Series X|S, Sony’s next-gen console currently doesn’t support native 1440p resolution, which does hurt PS5 owners playing on 1440p screens as games are likely being upscaled from 1080p resolution to 1440p.