You should also should start fermenting your mustard now, too.
Note: this corned beef will not have the pretty pink coloring of the corned beef you might find in the store. If you are partial to the coloring, you can always add some juice from purple cabbage sauerkraut to your brine mixture. Either way, pink or not, the taste is fabulous!
You can also make fermented corned beef, and Wardee shows you how in the Lacto-Fermentation eCourse.
Homemade Corned Beef on Rye https://traditionalcookingschool.com/food-preparation/recipes/homemade-corned-beef-on-rye/