Hello...
Same case with my application. I submitted by PR documents on 13th Jan 2021 and got AOR on the same day. Eligibility check and medical is showing as not progress as of now.... but background check is in progress...
You need to just take the letter format with you and ask bank manager to verify and print on bank letter head with their signature..
if your bank says they don't provide such letter...just search for another branch and visit there...simple.