KNOW THAT ANYTHING that is said on days other than Friday should also be said on Friday. It is mustaḥabb to perform more dhikr on Friday and to increase in praying for blessings upon the Messenger of Allah 
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.We relate in the book of Ibn as-Sunnī from Anas 
who reported that the Messenger of Allah said: “If a person says thrice on Friday morning before the Ṣubḥ ṣalāh: I ask forgiveness of Allah, besides Whom there is no god, the Living, the Self-Subsisting, and I repent to Him, Allah will forgive his sins even if they be as abundant as the foam of the sea.” [1].
who reported that the Messenger of Allah said: “If a person says thrice on Friday morning before the Ṣubḥ ṣalāh: I ask forgiveness of Allah, besides Whom there is no god, the Living, the Self-Subsisting, and I repent to Him, Allah will forgive his sins even if they be as abundant as the foam of the sea.” [1].
Astaghfiru-llāha-lladhī lā ilāha illā Huwa-l-Ḥayyu-l-Qayyūmu wa atūbu ilayh.
It is mustaḥabb to make du‘ā’ in abundance all day on Friday, from the breaking of the dawn until the setting of the sun, hoping to coincide with the moment of acceptance. There are different opinions about this. Some say it is after the break of dawn and before sunrise, some say it is after sunrise, some say it is after midday, some say it is after ‘Aṣr, and some have other opinions. The most correct view, or rather the correct view—no other one being acceptable—is that which is expressed in the Ṣaḥīḥ of Muslim [2].on the authority of Abū Mūsā al-Ash‘arī: that the Messenger of Allah said that it is between the time the Imam sits on the minbar and the time he says the salām to end the ṣalāh.
said that it is between the time the Imam sits on the minbar and the time he says the salām to end the ṣalāh.References
[1] Ibn as-Sunnī (82). Its chain is very weak, as it includes Isḥāq ibn Khālid, who narrated from ‘Abd al-‘Azīz ibn ‘Abdullāh, who narrated from Khusayf from Anas. There is a difference of opinion regarding Khusayf, who did not hear this hadith from Anas. ‘Abd al-‘Azīz was accused by Aḥmad of lying. As for Isḥāq, Ibn ‘Adī claims that he narrated munkar hadiths. See Ibn Ḥajar’s Natā ’ ij al-afkār (187).
[2] Muslim (853).