[Presented at HWO25 "Towards the Habitable Worlds Observatory: Visionary Science and Transformational Technology"] Time-resolved high-contrast observations pioneer new approaches for characterizing atmospheres of distant worlds, creating pathways for future exoplanet surface mapping with the Habitable Worlds Observatory. Our JWST monitoring campaigns of directly imaged exoplanets using NIRCam coronagraphic imaging and NIRSpec IFU spectroscopy demonstrate the power of temporal observations for revealing atmospheric dynamics and cloud patterns through rotational phase mapping. Our flagship 20-hour dual-band monitoring program of Beta Pic b with JWST's NIRCam coronagraph has achieved an order-of-magnitude improvement in high-contrast imaging precision over ground-based facilities, enabling detection of ~1% photometric variability. This breakthrough capability allows us to map atmospheric features and probe the planet's angular momentum evolution—techniques directly applicable to future HWO observations of potentially habitable worlds. This breakthrough capability allows us to map atmospheric features and probe the planet's angular momentum evolution—techniques directly applicable to future HWO observations of potentially habitable worlds. While JWST targets young, self-luminous gas giants, HWO will extend these temporal mapping capabilities to reflected-light observations of temperate terrestrial planets, potentially revealing continental distributions, ocean coverage, and weather patterns. The lessons learned from JWST's exoplanet monitoring campaigns provide critical insights into observatory stability requirements, coronagraph performance, and data processing techniques that will inform HWO's design and operations.