In quite a few reports erroneous on social networks, it is said that this is a shipment of American equipment to Ukraine, and it is interesting to find even "reputable" newspaper websites which uploaded the video they found on social networks, and talk about the shipment of American military equipment to Ukraine.
As you can see in the video, it is indeed clear that this is American military equipment, tanks, various APCs, engineering equipment, trucks, lined up on the Gdynia port dock.
From a brief examination, it appears that the military equipment seen in the video apparently belongs to the 3rd Brigade Combat Team, from the US Army's 1st Cavalry Division (3rd Brigade Combat Team, 1st Cavalry Division) which arrived for deployment in Poland at the beginning of last December, as part of the "Atlantic Resolve" mission.
After their mission period as part of NATO forces (in Poland, Latvia, and other places) ended and they were replaced in February by the 2nd Armored Brigade Combat Team from the 1st Cavalry Division, the vehicles and equipment belonging to the unit also arrived at the port of Gdynia for the purpose of loading for shipment back to the USA.
So if it is indeed the equipment of that American military unit that finished a planned deployment in Europe, and was brought to the port for the purpose of loading it for shipment back to the USA, it is likely that these are photographs from February, and not from yesterday.