Thanks for prompt response.
1. 17th January 2023 (it's equal to the "receipt date" on the top left side of the receipt form) --> So should I consider 17th January 2023 as NOA1 date?
2. Don't know what you mean. The receipt notice actually is the I-797 form. --> I found over internet that there is "I-797" printed on the receipt notice, so just wondering, how "I-797" is not there in online receipt notice.
3. We petitioned online and beside the online form they've also sent a paper version per snail mail. Maybe it's not always the case, though. --> Surprisingly I have not got the paper copy of the Case by snail mail.
I have already created online account at USCIS for tracking the progress. It is currently showing 7 more months for processing.