Changes due to the Coronavirus. Her son always wanted chickens as a pet. This has become a project during self-quarantine as they now have the time to set it up right. They have an activity. He has the pets he has wanted and she now has fresh eggs. This is a true win/win for all concerned. No longer does her son have to egg her on.
In this case, “the 'chickens have come home to roost'” has a positive meaning. Time and a desire for family activities, a pet and eggs, all come together for this family.