The spacecraft is loaded with a number of experiments with one being the
Earth Surface Mineral Dust Investigation (EMIT) that has been developed by NASA's Jet Propulsion Laboratory in Southern California. It employs NASA imaging spectroscopy technology to measure the mineral composition of dust in Earth's arid regions. The mineral dust blown into the air can travel significant distances and affect Earth’s climate, weather, vegetation, and more.
The Dragon craft is expected to slowly catch up with the ISS and
reach it
Saturday morning (July 16) at around 11:20 a.m. EDT. After Dragon docks with the orbiting lab, astronauts will unload the capsule's payload, which includes fresh food and supplies, as well as scientific equipment for the ISS's dozens of active scientific investigations. .
Source : Live Science