The Thermal Infrared Sensor (TIRS) on the Landsat Data Continuity Mission will provide two-channel thermal imaging as a continuation of previous Landsat missions. TIRS will use a pushbroom imaging system with a quantum well infrared photometer detector. Its data will help monitor land surface temperature, evapotranspiration, and other metrics. While the development schedule is aggressive, significant hardware has been delivered and the design is finalized pending ongoing testing and integration activities.