We haven’t quite met Kang the Conqueror in the MCU, but Sylvie does kill He Who Remains, thus allowing the timeline to branch left and right, opening up the multiverse to create Kang. In the episode after the slaying, Loki attempts to warn Owen Wilson’s Mobius, but he cannot remember his TVA advisor. Thus, Loki has entered the Multiverse of Madness, and he’s reportedly going to return next in the 2022 Doctor Strange movie alongside Benedict Cumberbatch and Elizabeth Olsen.
Article source: https://www.cinemablend.com/news/2570506/ant-man-and-the-wasp-quantumania-writer-response-loki-finale-multiverse