How can I see the all certificates assigned to virtual servers on cli

you can see what ssl profiles are attached to a vip.

list ltm "name of the vip"  - under the profiles you will see the profiles attached. the "context clientside" should be the ones that are SSL profiles attached to the vip

list ltm "name of the vip"  | grep -B 1 clientside   - this should give you a list of  clientside SSL profiles attached to a vip
list ltm "name of the vip"