Are the mentioned hadiths that speak of the Prophet's (peace and blessings be upon him) visions of the conditions of his Ummah on the Day of Resurrection, and some other hadiths about the virtue of overlooking the insolvent, giving the debtor respite, and feeding the hungry, authentic?

The hadith "Whoever feeds his brother a morsel" was deemed weak by Al-Sakhawi and Al-Ajlouni. Ibn al-Qayyim, Mulla Ali al-Qari, and Al-Biruni stated that it is fabricated and a lie. As for the hadiths "Whoever grants a debtor a respite" and "Whoever feeds a hungry person," they have not been found with these exact wordings in the books of Sunnah. However, many hadiths have been authentically reported regarding the virtue of granting a debtor a respite, feeding the hungry, clothing the naked, and honoring the weak.