Hi jimbot58
I would avoid installing the mini box until the actual V6 is ready to perform the migration to 360.
It can take a couple of days for the actual 'update' icon to be made available on the V6 box, although sometimes it appears in the Apps folder rather than on the Home screen. This may be due to expected delivery days/times as in the past the box has updated automatically prior to the customer actually receiving the 360 remote control, meaning they've been unable to watch TV.
The actual conversion from V6 to 360 is an over the air update, (the hard drive is formatted and then the Horizon operating system is installed) however the V6 box connects to the servers approx once every 6 hours to update the EPG it may pot have received the update/conversion signal yet, and so that may be sent overnight.
You could try rebooting your V6 box to see if that forces the update signal and icon to be sent to your box.