As aforementioned, the software has been available in an official capacity for quite a while. But as is ever the case, it's taken a while to reach certain users, since carriers like to add their own finishing touches before pushing out a major update.
Android 6.0.1 Marshmallow for the Galaxy S6 and S6 edge includes all of the perks you'll surely be familiar with right now, including Google Now on Tap, a new-look notification panel and Doze, which should better help you to conserve those precious droplets of battery. Since it's Android 6.0.1, you also get the March security updates.
If you do happen to own the S6 or S6 edge on Verizon, you may not get the OTA notification right away. As ever, the update is being pushed out in waves, so may take a few hours or even days to finally hit your handset.
As you wait, here's a look at some screenshots we took when our own Galaxy S6 was updated from Lollipop: