The start of the operation of the High Luminosity Large Hadron Collider (HL-LHC) is planned for the year 2030. The associated increase in luminosity provides an opportunity for further scientific discoveries, while also introducing many technical challenges for the systems of ATLAS. The HL-LHC environment has necessitated the Phase-II upgrade of the ATLAS hadronic Tile-Calorimeter (TileCal), which will ensure its peak performance in the coming decades. The upgrade will take place during the third long shutdown of the LHC. It will encompass the replacement of both on- and off-detector electronics, the implementation of new on-detector mechanics, as well as the replacement of photomultiplier tubes located in the most exposed regions of the detector. The on-detector electronics of the TileCal are powered by 256 adjacent Low-Voltage Power Supplies (LVPS), which in turn contain eight transformer-coupled buck converters, known as bricks. These bricks function to step down the power received from off-detector bulk power supplies to that required by the front-end electronics. The South African cluster, headed by the University of the Witwatersrand, is responsible for the research and development, production, quality assurance testing, and integration of half of the required bricks for the Phase-II Upgrade. This contribution provides an overview of the South African cluster's contributions to the development and production of the LVPS bricks for the ATLAS Tile-Calorimeter Phase-II Upgrade. It highlights the current project milestones, including research, development, and quality assurance achievements, and concludes with an outlook on the remaining activities critical to ensuring the project's success.