can S4 Hana migration be performed before month end closing?

Hi,

Our client is looking for S4 HANA Finance migration to be done during mid of the month (during their shut down period). As per SAP guidelines, I know that S4 migration has to be done immediately after closing month end. Can you please advise whether it is feasible to do in the mid of the month? if Yes, what are the challenges to be faced, mitigation plans etc., ?