Release dates for Hasbro are never solid when it comes to in-store availability. It depends on if stores like Walmart/Target/Toys R'Us (Canada/other countries) decide to make orders for them for inventory. Here's a good retail page for Hasbro Beyblade waves if you don't want to rely on the wiki:
https://www.entertainmentearth.com/s/tops/p
In-store, Hasbro Beyblade availability is incredibly inconsistent from a state to state and even individual store to individual store. In my area of Texas, the most recent wave we've received Slingshock Dual Pack Wave 3 while I've seen SwitchStrike Starter Wave 8 in California (ie. K1mbo's Beyhunt). Canada gets Hasbro products the earliest from what I've seen and some of their stores are currently on Hypersphere.
Takara Tomy usually makes announcements through their Youtube page, Corocoro Youtube/Magazine, Burst App or promotion page inside their products.
Simply a person who likes Beyblades