Relativistic heavy-ion collision experiments are used to investigate the high-temperature properties of the strong interaction at large particle colliders (LHC, RHIC). In particular, they allow us to probe the non-equilibrium properties of the Quark-Gluon Plasma (QGP) created therein. Experimental evidence points towards a fast thermalization of this medium, but the initial stages before thermalization are still associated with large experimental and theoretical uncertainties. Experimentally accessible probes are jets, a large number of collimated highly energetic hadrons measured in the detectors. These jets stem from a very energetic quark or gluon created in the initial collision and are therefore sensitive to all stages of the QGP evolution. When traversing the QGP medium, they radiate soft gluons and deposit energy, typically modeled by the dependence on only a single medium parameter, the jet quenching parameter . In this talk, I will describe how we extracted this parameter during the initial stages using QCD kinetic theory and obtain its evolution throughout the whole collision process. Based on arXiv:2303.12595, arXiv:2312.0047 and arXiv:2312.11252