The GPS from Maxut Zumayev shows where the climbers have progressed to. The Terrain map shows that they were past 8400m in height. All four climbers are still making progress so this is where all of them would be.
The progress throught the Japanese Couloir can be seen in this screen shot.
And finally a screen shot of this area shows that they are nearing the end of this and onto a more gentle( relatively) slope towards the summit of K2.