Would be nice, but it (that is, windows in this case) won't go to standby because by the time you get to the shutdown/update stage, power management is shut off.

Instead it turns into a lovely mini furnace in its pocket in my travel bag until windows deems that it has finished.

Edit: and that's what I find alarming. Once , I just hit the power button and closed my laptop and got on the plane, and about 15 minutes later I went to get something from my bag in the overhead compartment before we took off. Holy shit, was my laptop hot, and it was 70 percent through an update. Presumably it was throttling due to heat and the throttling was making the updates even slower so it was a vicious cycle.