Just checked:
The G-band photometric uncertainties in EDR3 are ~0.3 mmag for G<13, 1 mmag at G=17, and 6 mmag at G=20 mag.
In Data Release 2 from 2018 April, uncertainties were ~1.0 mmag for G<13, to around 20 mmag at G=20.
So that is a big improvement!
