Dexcom/Tandem Control-IQ system (sensor-augmented pump and CGM combination) multi-site RCT comparing automatic vs. manual insulin delivery found 2.6 hours per day more (or 10% more) time in range and fewer highs and lows. These data have already been submitted to FDA for approval of this system.
Summary article here- https://www.fiercebiotech.com/medtech/closed-loop-artificial-pancreas-from-tandem-dexcom-aces-type-1-diabetes-study
NEJM abstract- https://www.nejm.org/doi/full/10.1056/NEJMoa1907863
Full article behind paywall- sorry!