This should work in CM:
OrderContext.Current.OrderGroupUpdated += Current_OrderGroupUpdated;
OrderContext.Current.OrderGroupDeleted += Current_OrderGroupUpdated;
We are working to update CM to use the new abstraction APIs, so you will be able to callback soon
Is there any events triggering from the Commerce Manager? My goal is to make some actions based on when the admin is releasing or completing a order?
None of these seems to be triggered https://world.episerver.com/documentation/developer-guides/commerce/orders/order-events/