Following is the timeline for my mother's application:
Application Submission: Apr 29
Confirmation of Application submission: Apr 30
Biometrics Collection Letter: Apr 30
Biometrics appointment: May 5
Biometrics validity letter: May 12
Original Passport Request (Visa approval): May 12
She has a valid US visa and has been to the US and Canada in the last 5 years so maybe that helped accelerate the visa processing in her case.
Best wishes to everyone here with their applications!