If your husband is selected, they will reply back to him with in a couple of weeks. After that he needs to provide a Police Clearance certificate. If the visa approval process takes around 4 to 6 weeks. Once the visa is approved they can immediately get you all here.

But yes make sure the offer is good. Rents are very high in Qatar. You should be aware of that a good house will start from QR. 6500 per month.

Wish him luck!!