The Main merits of holy day of Friday are:
1. Allah created Adam alayhis salaam on Friday and he was granted entry into jannah on Friday.
2. Adam alayhis salaam was sent to earth on this day as his vicegerent.
3. Adam alayhis salaam died on a Friday.
4. There is a blessed hour on Friday during which a person is granted anything lawful and good by Allah that he prays for.
5. The blessed hour on Friday is such that Duas are answered and accepted,(from my research its an hour in ‘Asr to Maghrib)
6. The Day of Qiyamah-Resurrection will be on a Friday. It is on this day that the Trumpet will be blown on Friday; There is neither any angels nearest to Allah nor any heaven nor the earth nor the wind and a sea but all of them fear the Day of Jummah,that is why everything in the heavens and the earth including God’s most favourite angels and mountains, rivers etc. stand in awe of Friday.
7. There is such an hour on Friday that if any Muslim makes dua in it, his dua will definitely be accepted.” (Bukhari, Muslim)
8. Rasulullah sallallahu alayhi wa sallam said: Of all the days, Friday is the most virtuous. It is on this day that the trumpet will be blown. Send abundant durood upon me on Fridays because they are presented to me on that day.”
9. The Muslim who passes away on the night or during the day of Friday, Allah Ta’ala saves him from the punishment of the grave.” (Tirmidhi)
10. “The best day on which the sun has risen is Friday. On that day Adam was created, he was admitted to Jannah, and he was expelled therefrom.”[Muslim].