Hi Madii,
I found the below information in relations to proof of funds, I believe it could be used as reference to your question.
1. For proof, you must get official letters from any banks or financial institutions where you are holding your money.
Letter(s) must:
• be printed on the financial institution’s letterhead
• include their contact information (address, telephone number and, email address)
• include your name
• list outstanding debts such as credit card debts and loans
• include, for each current bank and investment account:
o account numbers
o the date each account was opened
o the current balance of each account
o the average balance for the past six months “””
2. Yes
3. As at May 4th, the processing time for all fall applications, submitted before May 15, from any countries is 10 weeks. Applicants should receive a final response by August 6.
You can also search other threads for more information on joint account and sponsor.
All the best