You could research lady's mantle. It may shrink fibroids. It is a very safe herb, although a person should always be careful with any herb if they are taking any medications, are pregnant or breastfeeding.
This site will give other ideas that you can try while you are waiting, including diet, stress reduction, exercise & herbal suggestions closer to the bottom.
https://www.birthsongbotanicals.com/blogs/birth-song-blog/uterine-fibroids
You may wish to see what Rosemary Gladstar and/or Susun Weed may have to say as well. They are experienced herbalists specializing in women's care. They may have some odd ideas in some areas, but their herbal knowledge is solid. Aviva Romm is also a good resource. She is a midwife & MD.
Hysterectomy comes with its own problems, often including prolapse. It's worth checking other options out if you can avoid the surgery at all.
Hedleys sells a few herbs and Sobey's Extra used to sell St. Francis Herb Farms tinctures. I have no idea what they might have available, although for optimal liver function, which is important to help heal the body, Hedleys should have dandelion & burdock root.