Can we know ip address of Standby from Active?

One way:

list cm device bip* { failover-state management-ip }
cm device bip1 {
    failover-state active
    management-ip 10.0.0.1
}
cm device bip2 {
    failover-state standby
    management-ip 10.0.0.2
}

This assumes you only have a single traffic group. There are other possible IPs in there you might be interested in, like the unicast and configsync IPs. To see everything just remove the { * } from the list command.

It's also possible for both nodes to be active, so you have that, you'd want to see who's active for a particular traffic group:

 show cm traffic-group *

------------------------------------------------------------------
CM::Traffic-Group
Name                      Device                   Status   Next
                                                            Active
------------------------------------------------------------------
my-traffic-group     bip1  active   false
my-traffic-group     bip2  standby  true
traffic-group-1           bip1  active   false
traffic-group-1           bip2  standby  true
traffic-group-local-only  -                        -        -