Support for shopping features such as Coupons is being tested in Microsoft Edge Canary on Android. The capability was enabled by default for PC users with Edge 87 back in November 2020.
Microsoft Edge is frequently updated on PC and mobile, especially in channels such as Dev and Canary. Approved features and fixes typically get promoted to the Beta release before eventually being made public. We recently found out that Microsoft has been testing reverse image search capabilities in Bing sidebar in Edge Dev on desktop, and today, it has been revealed that shopping features such as Coupons are being tested in Edge Canary for Android as well.