The following two papers compile catalogs of L6-Y1 ultracool benchmarks (as discovered by Feb 2021), including their spectral types, photometry, parallaxes, host star ages, and homogeneously derived physical properties (based on Saumon & Marley 2008 hybrid evolutionary models). These benchmarks include wide companions to stars/WDs, members of young associations, and brown dwarfs with dynamical masses.

Catalog of L6-T6 benchmarks: Tables 3-4 of https://ui.adsabs.harvard.edu/abs/2020ApJ...891..171Z/abstract

Catalog of T7-Y1 benchmarks: Tables 4-5 of https://ui.adsabs.harvard.edu/abs/2021arXiv210205045Z/abstract