How to list what certs are installed on a RHEL Server, from the host

I am by no means any expert when it comes to certs on RHEL and openssl commands.

I do know that I can use the following command against another RHEL host, if I know the port number, to display what certificates are being sent:

openssl s_client -showcerts -connect xx.xx.xx.xx:8081

What I'm wondering, is if there is a way to display all of the certs currently installed on a RHEL physical server from the CLI?

I've tried the following command:

update-ca-certificates

Which didn't show any output.

thanks