Snapvault size to be transfered

Hello to all, this is my first post here :-).

How to see what is the size of snapvault to be transfered ?

I'm doing a snapvault to the other location.

I use this command to track the currently transfered data.

snapmirror show -status transferring

But it would be very helpful to know the amount of data that is still needed to be transfered.

Please suggest any way to get (or calculate) this information...

Thanks,

Hrvoje