Does 盛り mean さかり, prime (of one's life); one's best days?
I am not sure I understand 今を咲く either. I did find 今を生きる to mean "live in the moment", so does 今を咲く mean "bloom in the moment", "bloom without concern for tomorrow" (equivalent to live the moment but for plants?)
How do you translate this into English? A cherry flower that