vcenter 6.7 -> 7.0 upgrade is stuck

We are migrating from vcenter 6.7 to 7.0.

Stage one completed without any issues, stage two seems to be stuck on Starting VMware Performance Charts...

Performance charts on the old and new vcenters don't seem to be showing any activity indicating data transfer between vcenters.

Is there another way to check if the transfer is still going? We have been looking at this screen for over 30 min

Thanks