I think they should either take express envelopes on the day of the interview or email approval letters to save some time. Police check, they checked many times already. After interview do they check again?
Great news. Please update your timeline on the Excel sheet.
https://docs.google.com/spreadsheets/d/1JYRvi6XH4LKUvdCW5vmCG44U7VG469oZNQeKgceVDO4/edit?ts=589cfc5c#gid=0
Cheers