@imaltesers , as I mentioned earlier a person is considered a resident for the whole year when one passes the Green Card test. Also it states that the year is from the first day of presence in the USA. Thus , given your answers as to presence in the USA, I would surmise that you are a resident for the whole calendar year and thus subject to world income taxation for the year 2020.
When you file jointly , there are benefits especially when you have children etc. If you do not have such a situation, i.e. ONLY two of you, may I suggest that you file as Married Filing Separate--
(a) this will allow your spouse to file normally and I assume that he/she would use standard deduction
(b) this would , since you have zero US earnings for the year, to declare your foreign earnings, and then claim the foreign taxes as foreign tax credit. This credit while recognized fully is allowed only on a ratio basis --- foreign income to world income-- and in your case these being the same, you will get to deduct/credit for all the taxes paid. This would be beneficial, especially if you do not have foreign income in follow-on years.
Does this make sense or do you need more help/explanation etc. ?
