My recollection is that California has until 7/7 to finish up.

Toby Ziegler at Liepar Destin's new site, TheProgressiveWng.com gives us some new info:

In the last California primary update, on June 21, Clinton lead Sanders statewide by a 9.5 percentage point margin or at 54.3%-44.8%. Now, eight days later, Sanders has trimmed the former Secretary’s lead a point and a half to 53.6%-45.5% or 8.1 percentage points (he cut it another 0.2 percentage points as of 6:42 pm). More notably in fact, he has cut her statewide lead by around 70,000 votes (from 478,000 to 408,000) since election night and another 38,000 since June 21. This is largely due to him winning the huge majority (~60%+) in the later counts in large counties such as Santa Clara, Los Angeles, and San Diego.

Sanders has overtaken Clinton in the post June 7 vote in Fresno, Los Angeles, Napa, and Monterey Counties, as depicted on the updated late vote election map above (you can view the interactive map here). He also defeated Clinton among the 2,203 late votes in Madera County (which had previously not reported since June 8), winning 56% of them which was a complete reversal from the election night totals. Furthermore, Sanders has expanded, to varying degrees, his late vote leads in Orange, San Diego, Ventura, San Luis Obispo, and Butte counties, among others…

Find more specifics at the link.

Here's the link to his interactive map.