As of Block #479707, SegWit (BIP141) has met 95% threshold for the current difficulty period.  It's not officially locked in until the end of the difficulty period which is sometime tomorrow at Block # 479808. There will be a grace period of 1 difficulty period or 2016 blocks to allow miners, wallets, and nodes to get support SegWit. SegWit will be officially activated at Block #481824 which will be sometime around Aug 22nd.

Edit: I found this post which might help add some more clarification. https://medium.com/@jimmysong/segwit2x-what-you-need-to-know-about-the-2mb-hard-fork-27749e1544ce