From the 2017 Motor Trend Truck of the Year stats, you'll have to extrapolate a bit...
2017 Ram 2500 4x4 Crew, 6.4L Hemi, 4.10 axles, 66RFE: 16.2 seconds at 87.3 mph
2017 Ram 3500 4x4 Crew dually, Cummins 900, 4.10 axles, Aisin AS69RC: 16.6 seconds @ 84.0 mph
So you can also expect low 16s and mid-to-upper 80s for a 2500 Cummins.