Not yet, but it can be herd specific. You're hunting Eagle caps soon right? I'm not familiar with those herds.
I dropped a game camera off early this morning in a wilderness right around 6500 ft (not the Eagle caps), and didn't hear any bugles while up there. Saw a bunch of fresh beds and tracks, which is always encouraging. And picked up a different camera last weekend at around 7000ft in a different wilderness area, and also had fresh tracks but not bugles yet.
Should start getting into early rut the next few weeks though. These areas are typically peak rut mid-September, and that is when we're going in for our trip.