Sadr-as Sharia’ Mawlana Mufti Muĥammad Amjad ‘Alī Aazmi rađiyAllāhu anhu says,

It is desirable to trim one’s nails on Friday but if they are very long one should not wait for Friday because letting one’s nails grow in length is a cause for decrease in one’s provisions. (Bahar Shariah, Part 4, pp. 195, Madina-tul-Murshid Bareilly Sharif)