وَهُوَ الزَّمَانُ الَّذِي يُتَرَقَّبُ وُجُودُهُ بَعْدَ هَذَا الزَّمَانِ
The future is the time expected to occur after the present time.
Here anticipation characterizes the direction of time; it does not by itself assert certainty about a particular event. A future predication places its occurrence after the present point of reference.
Even if an event's exact external date is unknown, the form and its context can present it as past, present or future. The question under discussion is how temporal reference is conveyed rhetorically, not the settlement of every philosophical problem about time.