In a move that's not exactly unexpected, Valve has now delayed the launch of the official Steam Deck Docking Station.
Written in an official update, the Valve team said it was due to both a shortage of parts and closures at their manufacturing facility due to COVID. No further date has been given and they said they will share more info when they have it. The good news though is that the schedule for shipping the actual Steam Deck is not affected as it's different parts and a different factory responsible for it.
Valve ended the post by mentioning how they continue to improve the "docked experience for Steam Deck with all USB-C hubs and external displays".
Right now, the docked experience isn't the best. For all the pros the Steam Deck has, the docked experience is something of a sore spot. It's a mixture of things between issues in the KDE Plasma desktop when connecting up external monitors, to resolution issues in Gaming Mode when docked. The problems are all solvable and for the most part it works but there's a lot of quirks left to solve. Valve may not have said so, but it's likely also a big factor in the decision not to release it yet.
If you are after a USB Hub that works well, I've used this for months now and it has been working nicely for me.