The virtue of sending ṣalāh (supplications for peace) upon the Prophet ﷺ on Friday begins from sunset on the night of Jumuʿah (Thursday night) and finishes at sunset on the night of Saturday (Friday night). Moreover, sending ṣalāh upon him during the day of Friday is better than during its night (Thursday night).
تفضيل الصلاة على النبي ﷺ في الجمعة يبدأ من غروب الشمس ليلة الجمعة وينتهي بغروبها ليلة السبت، والصلاة عليه ﷺ في نهار الجمعة أفضل من ليلها
إنَّ اللهَ وملائكَتَهُ يُصَلُّونَ على النَّبي يا أَيُّها الذِّين آمَنوا صَلُّوا عَلَيهِ وَسَلِّمُوا تَسْلِيما ً
Don't forget to send Salutations on Prophet ﷺ
Allah the Almighty will do this for you:
Anas bin Maalik (radhi Allaahu anhu) said: Verily the Prophet (salla Allahu alaihi wa sallam) said:
Whoever sends Salah upon me once Allah will send ten upon him and remove ten of his sins and raise his rank by ten levels.
[Imam Ahmad in his Musnad, Imam Bukharee in Adabul Mufrad #642 and #643. Jami Sagheer #6359
تفضيل الصلاة على النبي ﷺ في الجمعة يبدأ من غروب الشمس ليلة الجمعة وينتهي بغروبها ليلة السبت، والصلاة عليه ﷺ في نهار الجمعة أفضل من ليلها
إنَّ اللهَ وملائكَتَهُ يُصَلُّونَ على النَّبي يا أَيُّها الذِّين آمَنوا صَلُّوا عَلَيهِ وَسَلِّمُوا تَسْلِيما ً
Don't forget to send Salutations on Prophet ﷺ
Allah the Almighty will do this for you:
Anas bin Maalik (radhi Allaahu anhu) said: Verily the Prophet (salla Allahu alaihi wa sallam) said:
Whoever sends Salah upon me once Allah will send ten upon him and remove ten of his sins and raise his rank by ten levels.
[Imam Ahmad in his Musnad, Imam Bukharee in Adabul Mufrad #642 and #643. Jami Sagheer #6359