I trying to buy a house and they ask me for 2020 profit and loss
Do they want your 2019 schedule C? 2020 is not over yet and not available.
If you use Quickbooks for your business, simply pull a profit/loss report from there for any time period you want. Takes about 5 seconds.
A P&L is an accounting term and will not be found on an income tax return.
Basically what the bank wants is a total of your income and expenses to date ... supply that information in any manner you can that they will accept.