SFO in the Wiki shows October 31, 2017 as the commencement date ... but A350 shows on earlier dates (don't know the exact date it will first appear)... example below is for October 29, 2017 which is the earliest date I can find going back to October 20 and moving forward.
Edit: Image doesn't want to load ... but here's a link to it
http://imgur.com/a/4rg8l