US Immigration from Vietnam

We are waiting for wife's interview on Ho Chi Minh. Our hope was to be able to leave Vietnam in June 2021. Even with a interview on the next couple of weeks it is looking unlikely as we have much to do prior to leaving. Selling the condo as an example. Our 9 yr old USA Citizen son's school is a priority for us. The school years start/stop are very similar. He ends in Vietnam at the end of May and with some luck was hoping to have him enrolled in an USA school in time for the fall start. We really want to avoid interrupting his school season by uprooting him at midterm. He has been in Asia all his life and we want to give time to transition him to the USA Culture. We have not yet decided where we will live yet as I have just retired.

We understand the time limit is 6 months from the approval to travel to the USA but it will interfere with my sons school year.

Are there any options we may have to extend the time allowed to enter the USA? I am sure there have been others with a similar situation. I also understand there is a one year limit on the visa application process but not clear of when that begins. Is it the notice date or priority date?

Thanks

We have filled and submitted both I-864 and DS-260 for my wife's IR-1. At the moment, we're collecting all the documents needed, and we have everything except for the police certificate.

I could have sworn I read somewhere that VN police certificate does not need to be submitted with the NVC immigrant visa application and only needs to be taken to the consulate. But I can't find where I read on this forum or its guides anymore. Did I misread?

Petitioner. Self-employed, own a small business registered in the U.S. Will continue business after immigration.

If I'm using assets on my I-864, does my business assets count? Like, can I include cash in a business checking account on my I-864?

My wife and I are in Vietnam, and we re planning on an early 2022 move to the US. So we re thinking an interview around November or December.

I m aware it takes time to get one scheduled, so I m wondering when we should submit our docs to NVC and get DQ ed.

My thinking is around August for doc submission, get DQ ed around Sept-Oct, then get an interview scheduled in Nov/Dec.

Are things moving this quickly at the VN consulate, or do we need to send in our docs sooner?

Well we thought we were near the end of our long long ordeal, but it seems my fiancee will have to go back to the hospital for more testing. This is Cho Ray Hospital. They didn't say anything about why they made the decision but evidently the X-wasn't good enough. She's already scheduled to go in three more times for sputum samples (Acid-Fast Bacilii). I understand this will take about 10 weeks, and if we're particularly unlucky 6 more months of treatment could be added on to that pending a positive test result. Honestly it's crushing news after the enormous wait, I know we'll manage but it's very very disappointing.

My question for the forum regards the faster alternatives to the Acid test, such as the skin test or the blood test. Does anyone know if these tests are even available in HCMC? And if so, are they acceptable to the US consulate/government?

My guess is we're stuck with the slow test. Is it possible or even advisable to start treatment immediately just in case? Anyone have any experience with this situation? Thanks