https://wccftech.com/magsafe-duo-charger-could-launch-on-december-17-as-per-switzerland-online-store/

Even though we know the price and specifications of Apple's MagSafe Duo charger, it is still unclear as to when it will actually be available. Thanks to a listing by an online store in Switzerland, it seems that MagSafe Duo will be available for shipping or pick-up starting December 17.

As spotted by 9to5Mac, Digitec Galaxus, an Apple Authorized Reseller in Switzerland, has listed the MagSafe Duo charger's shipping and pick up date between December 17 and December 24. Although 9to5Mac saw the date as December 21, it has since changed to the aforementioned dates. Based on these shipping estimates, It is highly likely that Apple will also make the MagSafe Duo charger available in its online and retail stores between the same timeframe. However, it is also possible that the release date is just a placeholder and could change again.