Not sure how it’s set up on Linux Mint by default, but you need os prober to find your Windows drive when updating Grub config.
So, if you don’t see the grub menu you need to configure the timeout or something, but if you do see the menu but it’s only options are for Linux, then you need to set up Grub with os prober.
(Technically you don’t need the os prober and could do it manually, but you probably shouldn’t)
Duh, obviously it was before. It’s “Weird Al”, not “Al Weird”…