I am sorry to hear that you guys are in such a difficult situation.
If they say it's pending for an interview it sounds pretty clear that they your husband is going to be interviewed... Unfortunately however, I don't think anyone on these forums or in the IRCC can give you an idea of how long it would take for an interview to be scheduled merely due to how unpredictable things are with the pandemic.
Have you ordered your GCMS notes yet? Given that it sounds like they're going to interview, if you get a copy of the notes, you should be able to get an idea of what their concerns are so that you can prepare responses that will satisfy them and approve your application.