Cabbie I can only tell you what we did when my Mum died at home, bear in mind this was 30+ years ago. Her doctor knew she was close to the end and had given my Dad a number to call. We sat with her, I held her hand, we talked about nothing really. After her death was certified the funeral director was called. In between we sat with her, sometimes together and sometimes alone, to say our goodbyes. The funeral director explained what we needed to do next.
Is there no one you’d like to be awake with you as you wait cabbie? Family or friend? Be as you feel right as you sit with your husband. There’s no rule book for this. I felt I wanted to hold my Mums hand and talk to her, perhaps the same for you, perhaps not.
I’m so sorry you sound so alone. I’ll be thinking of you both, sending love.