What will happen to the nations that embraced Islam after the death of Prophet Jesus, peace be upon him?

There are no texts that clarify the fate of everyone who declared their conversion to Islam during the time of Jesus, peace be upon him. It is not unlikely that there were hypocrites at that time, just as there were during the time of the Prophet, peace and blessings be upon him. Allah knows best the situation, and one should not delve into unseen matters for which no text has been revealed. What is established is that people will not all remain steadfast in faith until the Day of Judgment. Rather, the Hour will come upon the most wicked of people after the souls of the believers have been taken, as stated in the Hadith: "The Hour will not be established until Allah, Allah is no longer said on earth," and "Allah will send a cold wind, and no one will remain on the face of the earth who has a mustard seed's weight of goodness or faith in his heart but that it will be taken," so the most wicked of people will remain, and the Hour will be established upon them.