If a person enters the masjid after the athan or while the Imam is delivering the Khutba, he must not sit down before praying 2 Rak’ah. This is the instruction of our Prophet salla Allahu alaihi wa sallam.

Yes, even after the adhan and while the imam is delivering the khutba

If the khutbah has started during the Juma’a prayer, can I pray the 2 rak’ahs even after the adhan and while the imam is delivering the khutba?

Prayer | March 26, 2014 4:40 pm
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Can you please clarify the implication of reciting a lower surrah in the first rakaah and a higher surrah in the second rakaah. Is it true that you should always recite a higher one in the first raakah and the lower one in the second raakah?
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In third unit of witr do we have to recite the dua which is recited before fatiha if we are praying 2 units first then salam then 3rd unit?