The Act of 31.03.2020 extends the deadlines for applying for residence permits if the deadline would fall within the period of an epidemic emergency or epidemic state. The regulations introduced on 18 April 2020 additionally allow for the extension of legal stay for foreigners remaining in Poland based on the visa-free regime until the 30th day following the cancellation of an epidemic emergency or epidemic state (the last of the states to be in force). If your time of stay in visa-free travel ends in April 2020, it will be automatically prolonged until the 30th day following the cancellation of an epidemic emergency or an epidemic state (the state which will be last in force). You then have more time to file your application.
You will find up-to-date information on restrictions on the functioning of The Office of Wielkopolska Province in Poznań HERE.