The Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) promises to drastically accelerate the discovery of ultracool dwarfs (UCDs) over the course of its 10 yr survey of the Southern Hemisphere. With the official start of LSST imminent, we showcase LSST's capabilities for discovering and characterizing UCDs using early commissioning data (Data Preview 1). The LSST photometric system at this stage remains untested for faint UCDs. Thus, we begin by crossmatching Data Preview 1 against known UCD catalogs. We recover one known UCD from the UltracoolSheet, 17 UCDs from the Dark Energy Survey, and 17 low-mass stars from the Gaia Catalog of Nearby Stars. Using these known UCDs alongside recent spectroscopically confirmed Euclid objects, we select 89 UCD candidates in LSST fields using both LSST and Euclid photometry, 17 of which are unique to this work. We present our candidates, photometric temperature estimates, and discuss lessons learned from using early LSST data products. Finally, we turn to the future and predict potential UCD counts in upcoming LSST commissioning data (Data Preview 2), which is expected to be available to the Rubin community in 2026. Using synthetic populations of brown dwarfs, we forecast over 17,000 L and T dwarfs may be detected and characterized in Data Preview 2, including several hundred known objects.