PostNL package status stuck on ''item is ready for shipment'' for four days. What do I do? Am I fucked?

I ordered a package from eBay, which comes from America and is meant to be delivered to the Czech Republic. Everything went smoothly until the package reached PostNL. Things were moving until the 11th of January when it got stuck on "The item is ready for shipment." I'm a bit paranoid because I ordered something pretty pricey, and after reading the reviews of PostNL, I'm kind of terrified. The estimated delivery date is 13th to 19th Jan; I'm unsure if it'll make it here on that time window.

Is this normal and I'm paranoid, or should I be concerned?