Dear @Sanduni,
Welcome to the Wefugees Community and thank you for reaching out to us.
Unfortunately, your husband will not yet fulfill the minimum requirements (minimum period of 6-8 years of holding a residence permit) for the naturalization yet. I tried to answer a very similar question once here before. You may find more details when following the link.
In any case, please also don’t hesitate to get back to us with any further questions.
All the best,
Meike