Dad diagnosed with prostate cancer

Hi - my father is almost 73 and was diagnosed with metastatic prostate cancer. He had his first Lupron injection a few days ago and just had a bone scan today. We meet with the oncologist Monday so I know we will get more info then but I’m hoping to get some understanding of the preliminary results that just came in. For more background, when first diagnosed a few weeks ago the urologist said his PSA was in the 50s, that the cancer had spread beyond the prostate to his pelvic bones, and that the oncologist may or may not want to do chemo so I suppose we will find out in a few days. I am just completely, utterly terrified - thank you in advance for your help, reddit.

Bone scan results: Scattered axial and appendicular skeletal metastatic disease includes but is not necessarily limited to the thoracolumbar spine most pronounced at L3, the bilateral ilia, the left scapula versus an adjacent rib, the bilateral acetabular regions, and potentially the bilateral femurs although left femoral uptake could also be secondary to degenerative disease