Oligometastatic cancer refers to a few numbers of metastatic colonies (of cancer) that may exist localized or in far places. It does not refer only to metastatic cancer at the lymph nodes.
The treatment therefore will be done with the best “at hand” for the place where the spots were found. Surgery, radiation and chemo may eliminate the metastases. Hormonal treatment may control any advancement by killing some dependable cells or turning them to become more “docile” (indolent).
Surely, surgery may not be wise if the cancer exist in restrictive places such as in bone, but lymph nodes could be disected or radiated. Focal RT seems to be the method of preference.
I would recommend you to discuss the matter with your doctor.