From what point will this regulation be valid?
The answer is in the Regulation:
Entry into force and application
This Regulation shall enter into force on the twentieth day following that of its publication in the Official Journal of the European Union.
This Regulation shall be binding in its entirety and directly applicable in all Member States.
Done at Brussels, 4 March 2020.
For the Commission
The President Ursula VON DER LEYEN