Subscription Manager

I would appreciate, if the Subscription Manger were able to do the updates for all installed products in one rush and without user interaction.

That is also our desire to reach this point.

Our product installers launched from TMS Subscription Manager itself need to be adapted for this to be able to run these unattended, so it can only start to fully work when all product installers have been adapted. 
It's on our todolist.

What is the current status of this? Is this now possible?

This is not yet possible.
We have been burried with work on many of the products itself (VCL UI Pack, WEB core, FNC, XData, ...) that we have not been able to give this priority yet.