It's done between Devon and Touhy.
That's Lincolnwood, not Chicago.
Pretty much Cyclocross north of the river to Devon. I noticed some progress between Pulaski (Granville) and Devon that indicates paving in the works. South of the river it's a mix of coarse gravel (especially on the bridges) and single track all the way to the southern terminus on Cicero (near Montrose). It's quite a challenge getting on and off there but doable for the adventure types.