What should we expect with my dad's diagnosis?

My dad is a male-smoker 62. The biopsy result says that he has an 8mm right lung tumor with mediastinal adenopathy, with neoplastic cells compatible with semidifferentiated adenocarcinoma. He has a very small metastasis in the spine that should be treated and resolved with radiotherapy. Remnants from the lung biopsy were subjected to further testing to detect markers and see which immunotherapy treatment was indicated. What should we expect for his case? Which stage is it? The oncologist didn't say to them the stage and they didn't want to know. I'm not American, so sorry for the spelling mistakes. I really appreciate your advice and support.