With guidance from above with the MRO watching it's progress, Opportunity is crossing the dunes to Endeavor crater. It still has about 17km to go, and expected to take about two years to get there.
Here is the latest image of the rover crossing the dunes like a dune buggy. The MRO is also being used to pick out a path for the rover to travel to avoid getting stuck in the soft ground. That's happened, but the tough little rover has always became-unstuck by basically "gunning the engine" backwards for a long time.
The latest photo was taken on sol 1783 (remember, 1 sol is about 39 minutes longer than an Earth day).