Hey @motow! Here is the data on Living End in Modern (the database resolves "Temur Living End" to the Living End archetype, which is the Temur-based cascade version).
Over the last 60 days, Living End sits at a 49.2% win rate (excluding mirrors) across 513 matches, going 245-253-15. That puts it right around the 50/50 mark, slightly below break-even. The broader recent performance figure across all tracked data is a touch higher at 51.3%, so the deck is hovering near the middle of the pack rather than thriving or struggling in the current Modern meta.
Sources: Data from 88 tournaments (72% MTGO, 28% Melee). Recent examples: