It is usually a good idea to update your information since your husband became a US citizen. Filing the green card application is a complicated process and I recommend consulting an immigration attorney.
Alexus P. Sham email@example.com (917) 498-9009. The above information is only general in nature and does not constitute legal advice. It does not create an attorney-client relationship.
You did absolutely right thing - you sent the request with I-485 application. Whether FB-2A is current is irrelevant, what important is under USC immediate relative petition there is an automatic waiver for unlawful presence and employment without authorization.
Yes you can uuupgrade and you took the proper steps to request it. You should be scheduled foran interview soon. Remindthe officer at the interview and take your husband's naturalization certificate with you.
The answer provided here is general in nature and does not take into account other factors that may need to be reviewed for a more precise answer. You should consult with an immigration attorney before taking any action. The answer here is not intended to create an attorney-client relationship.