Running catupgrd.sql with catctl.pl -n 8 in Oracle12c

Team,

We are upgrading databases to oralcle 12.2.0.1 from 11.2.0.4 in an environment where multiple databases share common Oracle home.

In this case, how the execution of catupgrd.sql with catctl.pl -n 8 would wo in 12c.? We understand that in prior to 12cr2 or 11gr2, we will have to execute the catupgrd.sql in all the databases manually. But, how it works in 12c, when we have multiple databases shares the same home and if we invoke catctl.pl to trigger the catupgrd.sql.

Please throw some lights here. Thank you.