Emerging 6G networks position eXtended Reality (XR) as a key service class that simultaneously requires very high throughput and stringent latency and reliability guarantees. Existing delay- and reliability-aware schedulers optimize resource block (RB) allocation under fixed transmit power and therefore ignore the intrinsic coupling between transmit power and achievable rate. In this work, we propose Power-Optimized Delay-Reliable XR Scheduling (PODRX), a joint power and RB allocation framework that leverages the PDU Set Delay Tracking Queue (PDTQ) mechanism for PDU Set delay budget (PSDB) monitoring. The scheduling problem is formulated as a Mixed-Integer Nonlinear Program (MINLP) and systematically transformed into a tractable Mixed-Integer Linear Program (MILP), which enables computation of globally optimal solutions. Simulation results show that PODRX reduces transmit power consumption by more than 50% compared with state-of-the-art fixed-power delay-reliability-aware XR schedulers, while simultaneously increasing the satisfied XR user count by approximately 20%.