Oracle OEM: get host uptime from repository

Hello,

I'd like to create a report about host uptime but I'm not able to find the right query to execute.

I've found an old question here where the answer was:

select target_name, value from mgmt$metric_current where target_type = 'host'

  and metric_column = 'SystemBootTime'

  and metric_name = 'SystemTime';

but on my OEM (12.1.0.3) this doesn't seem to work.

I need something similar but I wasn't able to find the right data sofar ...

any idea ?

thanks,

Roberto