32 TB size limit almost reached

Hi everybody.

I've got a large db, where the pg_largeobject almost reached (or maybe
already reached before vacuum_lo) the 32 TB size limit.

If I query

select pg_table_size ('pg_largeobject')                       35194084753408

select pg_total_relation_size ('pg_largeobject')             35692575506432

select pg_relation_size ('pg_largeobject')                     
35184358776832

I'm still running vacuum_lo and then vacuum -F

How can I tell how near to the limit my db really is ?