Which bank feeds are currently supported?

There is an extensive list of banks now supported through Xero, whilst some other banks which aren't directly supported, can be supported with a partnership

There is an extensive list of banks now supported through Xero - https://help.xero.com/au/BankFeeds.

For those that Xero doesn’t support directly, they have a partnership with Yodlee to support all other banks and financial institutions.