Greatest of a list of columns?

[Ron]

Postgresql 12.5

What's the canonical Postgresql method for doing, for example, this?
SELECT relname, MAXOF(last_vacuum, last_autovacuum)
FROM pg_stat_user_tables;

Seeing both last_vacuum and last_autovacuum is useful, of course, but 
sometimes I only want to see the "really" last time it was vacuumed.

I can hard code a case statement, but a generic multi-column solution is 
preferred.

Thanks

--
Angular momentum makes the world go 'round.