Sheikh Tusi in Misbaahul Mujtahid said: you should read the following if you wanted to send blessing to the Prophet (peace be on him and his descendants) on Friday:
اَللّٰهُمَّ اجْعَلْ صَلَاتَكَ، وَصَلَوَاتِ مَلَاۤئِكَتِكَ وَرُسُلِكَ، عَلٰى مُحَمَّدٍ وَاٰلِ مُحَمَّدٍ وَعَجِّلْ فَرَجَهُمْ۔
or you say:
اَللّٰهُمَّ صَلِّ عَلٰى مُحَمَّدٍ وَاٰلِ مُحَمَّدٍ، وَعَجِّلْ فَرَجَهُمْ۔
It was reported that he use to recite the following (100) one hundred times:
اَللّٰهُمَّ صَلِّ عَلٰى مُحَمَّدٍ وَاٰلِ مُحَمَّدٍ، وَعَجِّلْ فَرَجَهُمْ۔