To show the SSM maps that are applied to an interface, use the show igmp interface or the show mld interface command:
user@host> show igmp interface fe-0/1/0.0
Interface: fe-0/1/0.0
Querier: 192.168.224.28
State: Up Timeout: None Version: 2 Groups: 2
SSM Map: ssm-map-ipv4-example
user@host> show mld interface fe-0/1/1.0
Interface: fe-0/1/1.0
Querier: fec0:0:0:0:1::12
State: Up Timeout: None Version: 2 Groups: 2
SSM Map: ssm-map-ipv6-example