Red Hat outlines a four-step roadmap to prepare hybrid cloud infrastructure for quantum computing threats ("Q-Day"), emphasizing post-quantum cryptography (PQC) integration. RHEL 10 introduces NIST-standard quantum-safe algorithms (ML-KEM, ML-DSA) at OS level, while OpenShift 4.22 enables hybrid key exchange by default. Organizations should: (1) audit encryption footprints across hybrid environments, (2) test new cryptographic algorithms in non-production settings, (3) shift security enforcement to platform layer to avoid rewriting applications, and (4) govern data storage and processing with isolated environments. This aligns with White House Executive Order 14412 (federal migration by 2027–2029) and NSA's CNSA 2.0 mandate (TLS quantum-safe by 2030), making proactive preparation critical to avoid 3–5 year lag and data exposure risk.