Depending on the fish the temperature is the main issue as Dan ships in pressurized individual packages to help maintain oxygen in the water.
You can contact Dan's at:
and probably get a detailed status report and to also make sure that they are aware of the delay in case there is an issue. Your contact will likely be responded to by Jonny. He is cool and goes above and beyond to be helpful. Just note that you need to be pithy in the comment box as they don't allow for a lot of words. I THINK the max is like 500 characters.
Actually I'm a bit surprised that Dan's shipped with our current weather conditions as we have been under a winter storm warning for several days. Only about 8 inches of snow so far but the low temperatures have been as low as minus 13F. Sort of funny as, come Monday, the highs will be back around 40F.
If it seems that I know a lot about Dan's Fish it is only due to the fact that I do even though I have never had anything shipped from them. LOL! I just take a 2-3 minute walk from my apartment to their warehouse which is right next to my apartments. While I don't know the people well I do know some of the staff on a casual level, especially Jonny. I am sure that they will take care of you if there is a problem. If, in the worst case, the fish show up DOA take photos while the fish are still in the packaging to help show the situation.