You can view the progress bar on
https://wanchain.org/tokensale Currently 66% of tokens have been sold (including presale).
At 16:00 UTC today (4th October) Silver will be able to contribute along with Gold
I read somewhere that Wancahin did not conduct any pre-sale. I believe not everyone in the Gold list bought in and some bought less than their 6.8 eth meaning there would be much more left for the Silver list.