Hey Yashminaa,
Since you say that your husband was asked to submit his pay slips and all a month ago. Sounds like they have everything else they need from you. Else they would have asked for those as well.
Just to be super sure, do you feel like you have anything more to submit to them or anything that they'll ask you to submit addionally? If not then go ahead and apply for the request to conclude a case. I think it's the perfect time for you to apply.
I asked you to check if they'll want any more information from you because they can reject your request to conclude a case if they feel like you don't have the sufficient info or that they need more information from you. Then you would have to wait in the queue and can't apply for this request to conclude a case more than once.
If you ask me, I would suggest you to apply for the request to conclude a case as it looks like everything is perfect.
Hope this helps. Get in touch if you have more questions. Good luck to you!
Regards,
Shirani Juth