Is my presence in the US legal?

The change should have been filed before resignation. Was the change received by CIS on the 20th. if yes you are likely to be considered as not...

What are I-130 processing times for new USCIS Potomac Service Center?

As my colleagues have noted the processing times are not yet listed. Expect at least 90 days and more likely 6 months

If i marry in China can i live there with her as husband and wife? With just a travel Visa?

Not a US immigration question. You should contact the Chinese consulate for visa options. Once you meet your fiance you may file for her as your...

Is she out of status? Hw long she can stay in USA? Can she again on H1 if she got job ? Can we take legal action against emp?

If there was a change of status with the H-1B approval, she is no longer an H-4 and if not employed she is in violation of the H-1B.

I want to stamp my new H1B from Canada instead of my native country. Is this allowed ?

If you have held an H1b previously you may be able to seek H1b from US consulate in Canada. Speak with your employer's immigration attorney about...

My question is will can i renew my 2years green card if we divorce

Yes - it is possible to proceed with a self petition rather than using the joint petition. You should work with an immigration especially if you...

Can i transfer my H1 to new employer with extension receipt number or should i wait for extension request approval ?

You may transfer but run a risk your extension is not approved. Discuss the options with your new employer's immigration attorney .

Can one apply for the US Spouse Visa from a country that is not the US or the spouse's home country?

Yes if residing in Japan and the US consulate is accepting 3rd country nationals. Check the consulate website.

You may travel while it is pending with a valid visa passport and the J1 in status.

If i want to apply for my son to come to America. So how long will it take for him to be here in US "whole process time" ?

The petition for your son is as a priority petition. The priority classification depends on whether married or single. For an estimate of how long...