To be on the safe side I would file an extension in case you need to return to the US early. You can file Form 4868 which will give you an extension until October 15, 2020.
As @pk explained, you have an automatic extension until June 15th if you are living overseas on April 15, 2020. You will pay interest from April 15, but not any penalties.
You should file married filing jointly as it is a more favorable filing status. Include your wife on the extension you file.
The wage adjustment screen in the foreign earned income exclusion section of TurboTax is a calculation that you need to do before you can enter a number. If you had any US business days during your overseas assignment in 2019, you need to count the US business days you had after your assignment started. Whether income is considered foreign or US income, depends on where you worked. The IRS allows 240 as the number of workdays for your entire 2019 tax year ( or whatever reasonable number of days you work during the year). So that is 20 workdays a month. You had about 160 workdays during your foreign assignment in 2019. If you returned to the US after your assignment started and 10 of the days were US business days, you would multiply 10/160 * 70000 = $4,375 income related to US business days in 2019 during your assignment. So you would put a negative (-4,325) in the wage adjustment box. You cannot exclude US source income.
If you had no US business days, you do not need to enter anything.
Please see Publication 54, Tax Guide for US Citizens and Resident Aliens Abroad for more information
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