As your husband became a U.S. resident (green card holder) and meets the substantial presence test for 2018, he is considered a U.S. resident at the start of 2018 and you do not need to attach a first year year of choice to your joint tax return.
Please see this IRS document:
https://www.irs.gov/individuals/international-taxpayers/residency-starting-and-ending-dates
If his foreign accounts do not have a aggregate balance of more than $10,000 at any time during 2018, he is not required to file a FBAR.
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