Here are a couple of procedures to view the list of SSL certificates that are installed on your IBM i.
In DCM / IBM i Navigator
Bring up a list of the certificates using the Digital Certificate Manager (DCM). After signing on, highlight the security icon as follows:
DCM is the last one. DCM calls for another logon process, then select Open Certificate Store ....
And choose *SYSTEM ...
Enter the password again, then a list of installed certificates will come up
Using SQL services
Execute this SQL from "Run SQL Scripts" in ACS:
select * from table (
qsys2.certificate_info(certificate_store_password => '*NOPWD')
)