Much of this depends on the neighbor/friend's age...
Are they young, with young children? Offer to care for the children, take them to their activities, etc. This may help free them up for the hospital visits.
Are they older? Do things around the house/yard.... free them up to take care of the visits to the hospital. Mowing the lawn, watching the house, taking care of the pets, etc.....
Food is always appreciated..... they may be "eating on the run" .. fast food, sandwiches, all get very tiring after a while. If hubby is at a distant hospital, a gift card to a restaurant near the hospital may be appreciated, also.
Also... let them know..... anytime they need to talk, vent, unload..... let them know that you will be the willing ear, the shoulder to cry/vent on.... don't try to solve their problems.... just listen.