Someone did say they finish on the 9th though, not sure if that's right?
According to the website:
"Campaign period begins November 15, 2018 and ends April 6, 2019 or when supply of Coupon Codes is exhausted, whichever occurs first. "
"Following purchase, Coupon Code must be redeemed by May 6, 2019, after which coupon is void."
https://www.amd.com/en/gaming/raise-the-game