@buckokey
I understand your concern about the delay. I was in a similar situation as part of a Mayo clinical trial about 6 years ago. In my case, it was only for 6 months. I was diagnosed with breast cancer via biopsy, and a lymph node also tested positive. I met with providers at Mayo Rochester Breast Clinic. The clinical trial measured Ki-67, a protein and a crucial biomarker used in cancer diagnostics to assess how rapidly tumor cells are growing and dividing. I was on anastrozole for 6 months. The tumor was measured around 3 months, and the Ki-67 index had decreased. After 6 months, I had a lumpectomy. I was so ready to have the tumor removed.

If interested, here is a link to the clinical trial.
https://clinicaltrials.gov/study/NCT02206984
In your case, it sounds like taking anastrozole was a good decision due to another surgery being needed.

Have they done any additional imaging to see if the tumor has changed size?