Does downloading from financial institution work well?

yes. but that's a general statement.  every one is a little different: broker, company for W-2 import, banks for interest income import.   it is your responsibility to make sure that the import is accurate and everything that needs to be reported is even if not imported. most will not import all the info for royalty income and income from Widely Held Fixed Income Trusts.  one broker may be set up so you import dividends, stock transactions and interest income all in one import. others may require a separate import for each type.  also generally 1099-R's must be imported separately.   

Most imports will not be available until late Feb. or March.

And....2020 data will not be available for import  from banks, brokerages, and/or financial institutions until sometime into February.  ALWAYS check the imported data against your own copies for accuracy and to make sure you have everything.