The actual process is essentially the same than in an industrialized country: trucks that move goods from A to B. It's just that A, B, and the agent moving the goods are very different. By "different", I mean "much worse". Maladies: bad refrigeration, multi-week delays, places crumbling down.

Check this photo of a "bodega" in Cuba (first image in this page): https://www.cibercuba.com/noticias/2018-08-01-u1-e192519-s27...