What is the hypothesized maximum size for the largest, rarest objects within the Oort Cloud?

Comparable to dwarf planets like Ceres or Pluto

The size spectrum of objects populating the Oort Cloud is vast, ranging from small icy fragments only a few meters wide up to truly substantial bodies. While many objects are relatively small, astronomers hypothesize that the largest examples within the cloud could reach sizes comparable to known dwarf planets, such as Ceres or even Pluto. However, it is crucial to note that these extremely massive objects are considered statistical anomalies within the overall population count. The bulk of the mass, as mentioned elsewhere, is held by kilometer-sized bodies, but the largest possible size extends into the dwarf planet category.