US Immigration from Canada

I am waiting for my interview in Montreal- my DQ date was Oct 26/20.
Different situation- Hubby & I both currently live and work in Canada (he is dual citizen). I was wondering the process of what happens after approval. I know we have 6 months to get myself to the US, but is this to permanently live in the US or can we just cross the border and have my passport stamped and then return to Canada and continue to reside here? I don t want to do anything to hamper my US visa when I receive it but right now with covid we cannot easily go and visit the US and look for employment/housing. TIA

We received our approval for i130 on Thursday at around 2pm. It showed as such online and on our account. However unlike NOA1, when we received an email notice immediately after we submitted, we haven t received NOA2 notice by email yet.

We need this email notice to apply for Singapore COC (Police Clearance). That takes about 70 to 90 days to obtain when outside the country, and so I want to get on it ASAP.

How Long does it typically take to get the NOA2 notice by email after approval. Is there anyway to hurry it?