I have been thinking about the things that helped me. As other posters have said everyone is different but it may help to see some practical suggestions.
Come round to see a DVD and a take away. No need to talk much.
Cinema to see a girly film the OH would have hated. In your friends case a man film that you would hate OP?
Frequent texts that did not ask how I was but told me about something the texter was doing that I could respond in a normal way.
Requests for help. It made me feel I was still some use to someone. Maybe your friend can help your husband with a DIY job?
Friends who took no offence when I was rude, angry and impatient when they got it wrong!
Of course your DIL and son will be supporting him too. Can I just add,for you not to be put out if he seems to be getting more than his share of time and attention. You sound so nice I’m sure you won’t be, but it does seem to be a bit of a recurring theme on GN