You should check with the company as to their policy on when you could start working if the petition is approved when you are overseas. Much of that decision is outside the scope of immigration advice and involves tax implications for the company when an employee is working while abroad.
If you are traveling with a Canadian passport, there is no need for a visa to return. But if you’re traveling to India, please note you may get stuck unless you fit within an exception to the current standing proclamation prohibiting travel to the US from certain countries. You might need a national interest exception (NIE) to return or spend 14 days in a third country before return or wait until the travel restrictions are lifted some time in November. This is simplified for a quick response - Consult with an attorney if you are not already aware of the presidential proclamation travel restrictions in place that may impact you.
Even though USCIS recently discontinued the policy or rejecting filings for using blanks instead of “N/A,” sometimes it does make more sense to use N/A or NONE particularly to avoid an improper rejection. USCIS makes mistakes all the time and this particular issue is one that can invite such a mistake pretty easily. It is best to use a professional who will help you avoid those common mistakes or challenges. To prevent avoidable issues or delays, I strongly suggest hiring an experienced immigration attorney.
The answer to that question for your derivatives would be NO since the I-140 demonstrates YOUR education, skills, language abilities etc. Not theirs.
You should check other travel restrictions to ensure you may enter the US due to the pandemic. For example, if you were in Europe or China within 14 days before seeking entry to the US, you would still fit within the NIV travel ban.
That is incorrect. EB-1C is one of the few employment-based green cards that does not allow for premium processing. This is clearly stated on the USCIS website.
No, you cannot file in-person at the local office. Furthermore even if you could, walk-ins are not currently allowed due to the pandemic.
If you already received the receipt notice, you could conceivably send the photos as an interfiling with a cover letter and copy or the RN and hope to beat the RFE. However, just know it is very possible they won’t connect the photos you send to the file. They could also reject, deny, or RFE for missing photos and then you can then provide photos depending on what action they take.
Yes you can apply for the change of status to visitor status within the 60-day period. To ensure you file this properly, you should hire an attorney.
If you were just terminated and you want to file to change to B-2 status, you should hire an attorney to assist. This is through the I-539 filing process. You should also ensure this is properly filed within 60 days of termination - the sooner, the better.