US Immigration from Australia

I entered the US a few days ago on my E-3 visa which expires on 03/20/2020. The border officer gave me a admit until date of 03/14/2022 on my I-94.

The LCA which my current visa is tied to is for an employment period of 05/01/2018 to 04/30/2020.

I was going to renew my visa at a consulate overseas but COVID-19 has removed that option, I will likely be filing a I-129 with the USCIS now. My employer has already got another LCA approved for me.

So what date am I authorized to work until? The end of the current LCA? The end of the new LCA? Up until the admit until date on the I-94?

I can't find a straight answer anywhere. Any help would be appreciated.

Had an AOS interview scheduled for next week at NY field office. An announcement on their website said that cancellation letters would be sent out, and interviews rescheduled when they reopen for usual business, probably after April 1.

My fiance is applying for me to get residency in the US through the fiance visa program. The petition has been accepted, but we've waited more than 30 days and still haven't received anything from the NVC. She emailed them, as recommended by the letter they sent (which said we should email them if we don't hear from them within 30 days), however the only response they sent was an automatic email saying that we should call them. When she calls them, she is unable to navigate the options to speak to a real representative, rather than the automatic messages that aren't helping her. Does anyone have experience with this who would be able to help?

I know the question about visits has been addressed but, these are new circumstances. My fiance' is in Australia where travel is locking down in 2 weeks. There will be no interviews for the foreseeable future and we are at the NVC portion with a case number but nothing has shipped. Is it possible for her to visit with a return flight until this blows over? Thoughts...much appreciated.

I just went and visited https://www.ustraveldocs.com/au and found this message regarding interview cancellations (interestingly dated from tomorrow):

Information for visa applicants regarding novel coronavirus: As of March 18, 2020, the United States Consulates in Australia are reducing routine immigrant and nonimmigrant visa appointments. At this time your visa appointment is cancelled. We will resume routine visa services as soon as possible but are unable to provide a specific date at this time. The MRV fee is valid and may be used for a visa application in the country where it was purchased within one year of the date of payment. If you have an urgent matter and need to travel immediately, please follow the guidance provided at http://ustraveldocs.com to request an emergency appointment.

I wonder how many appointments will be cancelled... my K1 interview is currently set for 31 March and really hoping it won't be cancelled.