When the Turing based RTX series launched in October, 0 games supported RTX technology. However, that finally changed with this new RTX focused patch for Battlefield V, the world's first RTX compatible game. However, RTX on doesn't come very cheaply to Turing GPUs.
https://www.notebookcheck.net/RTX-on-or-off-Battlefield-V-s-RTX-implementation-cuts-performance-in-half-for-Nvidia-s-RTX-series-GPUs.361656.0.html