This is not in our short or medium plan. We understand the need but don’t feel like it’s our priority right now as we focus on the adoption of the modern workplace.Chris Eaheart commented
Going cross-tenant is key here - looking at a single site collection won't cut it. Must also look across site collections created as part of an O365 Group.
We don’t plan on adding progress indicator as we feel it would only become misleading because estimation are really hard to make due to technical limitations.