Hey April!
Sweepstakes end on the due date that was displayed when you signed up, so unless you signed up very near the close, the results could take a while. But yes,
provided that you are subscribed to the Microsoft Rewards email newsletter (because how could you not with email these days), you should receive an email if you win.
If you want to manually check on the status on any of your sweepstakes, you can do so here:
https://account.microsoft.com/rewards/redeem/winners
Good luck with the sweepstakes!