Effective monster level of monster levels 85-87?

Has the effective monster level of 85-87 monster level areas been released anywhere yet? I believe you can reach these levels with 4 ivory watchstones (correct me if I'm wrong).

Effective levels 70-84 were released here: https://www.pathofexile.com/forum/view-thread/1693152/page/1#p13440653. These appear to be static values, but maybe there's an equation?