QCD Axions are leading dark matter candidates that additionally solve the strong CP problem. The latest lattice-QCD simulations strongly favor the 40--400$~\mu$eV mass range for the QCD axions generated after cosmic inflation. The MADMAX collaboration aims to detect the QCD axions in this mass range by converting them into traveling wave signals using a novel detector called a dielectric haloscope. We report the current progress of the MADMAX collaboration with a focus on a recent measurement using a scaled-down dielectric haloscope.