H1-B Visa extension with approved I-140

[tnirav]

Hi,

I am currently on H1-B visa with 1 year left on my visa. I also have my I-140 approved. I am in the process of changing my jobs and had the following queries:

1) When my H-1B transfer is done, can I apply for an H-1B extension for 3 years at the same time?
2) If I do get the 3 year extension, does my employer need to start the green card process almost immediately or can they wait for some time?

Thanks for the help.


Regards,
Nirav