«إِلَى أَنْ هَرِمَ النَّهَارُ وَكَادَ جَرْفُ الْيَوْمِ يَنْهَارُ»
Until the day grew old and the day's edge seemed about to collapse.
Harima means to grow old. A day cannot literally age, so the expression personifies time. Jarf is a bank or edge, and yanhār evokes collapse.
Together these images make time feel physical: a long-lived creature and an eroding bank. The morning promise has lasted almost until night, with no sign of the promised return.