This question is an exact duplicate of:
Could you tell me what "would" function" here?
Questioner: hello. I've got a doubt concerning a statement to talk about the future: do we say the best student will win a prize or The best student is winning a prize?
Answer: The correct fom here WOULD be "will win". You WOULD say "is winning" when you are describing the present - i.e. when you are watching the prize-giving ceremony