# He will drop his ... he will cast off his

These two lines emphasize that this will surely happen.

# He will drop his unripe grapes like a grapevine

"Just like a grapevine drops its unripe grapes, so the wicked man will drop his strength"

# he will cast off his flowers like the olive tree

"just like an olive tree loses its flowers, so the wicked man will lose his strength"