Postgres: Get nextval in sequence without actually incrementing sequence?

It looks like select nextval('table_name') actually does the value increment. My goal is to "predict" the nextval value on all tables in the database without actually making any incrementation. This should be a read-only operation. I cannot run the select nextval on a read-only connection since it's actually trying to make a transaction. I would like to be able to query this and monitor the sequences on a read-only replica database. How would you tackle this and meet the goal?