autovacuum default run with vacuum_index_cleanup and vacuum_truncate and related lock?

Hi,

It’s Postgres 13 version, we plan to migrate from Oracle to Postgres 13 on RHEL8.  One maintain job is about autovacuum, with default config,  autovacuum will do on tables with  “vacuum_index_cleanup” and “vacuum_truncate” option?   With both options, autovacuum woker will hold “access exclusive” lock when truncate empty blocks and cleanup index ?  if that’s true, how to handle autovacuum to reduce the lock blocking issue?

Thanks,

James