VOP (especially in PWA version) is very popular with customers, one of the aspects to improve is the delay of notifications and the way they are handled.
I just think you could improve on that by implementing push notfications. doesn't require much effort, but it would give another UX to the end user
I hope my suggestion can help you create a better product.
making the product better UX side also means this.
The effort is minimal: but the UX is maximum