The situation in northern Syria and Iraq has developed pretty much as expected. So far, the Turks have been unable to re-take full control of the M4 highway. As a result of that failure, the joint Russian-Turkish patrols have not been able to move along the full length of the highway as spelled out in the agreement between Russia and Turkey. Clearly, Turkey lacks either the will, or the capability, or both, to remove the Takfiri forces from the M4 highway. So far, the Russians and Syrians have very kindly agreed to wait a little longer, but the recent visit of Russian Defense Minister Shoigu to Damascus clearly shows that big decisions are being worked on:
As for Iraq, the various Shia militias are doing exactly what everybody had predicted, they are executing limited but very disruptive strikes against US forces in Iraq. Here is a good infographic by the Institute for the Study of War which sums it up very nicely:
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