The coronavirus is raging all over the world, but mostly in China. China is one of the most important countries in gaming and electronics. Many manufacturers, including Nintendo, have the Nintendo Switch produced in China. China is extending the "New Year's Holidays" to contain the virus.
According to Nintendo, this also applies to the production of the Switch, but Europe should not be affected and so there will be little to no delivery bottlenecks for the cult console.
If one or the other console/accessory comes a little later than indicated, please exercise patience. The virus affects not only China, but the entire global economy, thus since graciously to the online retailers.
Whether this will change in the near future is not yet possible. At the moment, it looks like many game makers are emerging from the crisis as winners.