Hi @Inna
Yes, if you have a biometric passport or a Ukrainian ID, then you can still enter Germany after 04.03.2024 and apply for paragraph 24 protection.
There was a special rule put it place which is no longer in force since 04.03.2024. This, however, was more relevant for non-Ukrainian citizens entering Germany. Separate from that rule, Ukrainians have the right to enter the EU without a visa for up to 90 days. You must then apply for paragraph 24 before these 90 days are over.
Best,
Éanna