Questions about DJI Osmo Pocket Expansion Kit

Is the mount compatible with a GoPro chest strap?

When will this item finally be available? My order has been pending since 30.01.2019? At that time, the delivery time was said to be 3-4 days and not 3-4 months..........

I ordered this accessory a long time ago together with the Dji Osmo Pocket. Can you tell me when it will finally be available. The Dji homepage says 3.4 days! Thank you for your help

Good evening! I find it slowly ridiculous that a dealer like DIGITEC can not provide this extension set and this now for 2 months!!!!! Simply laughable and incompetent ! Nail the supplier to the wall with insistence and delivery promises if there is no other way! Many others do the same...as always, the stupid one is the end user! Greetings a DJI Pocket user waiting to upgrade his cam !!!!!!!