Typically, it should say next awaiting for customs charging and then it will be released, this will be on the tracker regardless what is the package and whether HM customs will do anything about it. Generally, a single watch should not attract any charges, they know these are fakes and of little value, I never heard of anybody being charged in UK. Exception would be only if you try to import a full suitcase of fake watches, that would be different story. And I don't think they will be opening your package, well you will know what trouble would that be when you receive it