It depend on which center process your petition. Normally, 3 months in advance is reasonable. If you are working using the EAD of OPT, you cannot work when you receive the approval notice(I797).
Follow the instructions.
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You need to file I539 to change your status(not visa). Download the form(I539) and read the instrcutions in it, http://uscis.gov/graphics/formsfee/forms/i-539.htm.
It depend on which center process your petition. Normally, 3 months in advance is reasonable. If you are working using the EAD of OPT, you cannot work when you receive the approval notice(I797).
It depend on which center process your petition. Normally, 3 months in advance is reasonable. If you are working using the EAD of OPT, you cannot work when you receive the approval notice(I797).