Intimacy After Chemo/Immunotherapy Treatments

Hopefully this type of question is acceptable and won't trigger anyone. My husband has started chemo/immunotherapy treatments for his BC. He had TURBT surgery in December and has muscle invasive carcinoma that has metastisized to some pelvic lymph nodes. No cancer was seen anywhere else on PETscan. He will have his bladder, prostate, and lymph nodes removed after chemo/immunotherapy treatments. Which is about 4 months from now. Intimacy after this surgery will be difficult and different. If my husband is feeling well after a treatment are we able to be intimate? Do we need to wait? Is it safe? I've read about it online but the articles/opinions pertain mostly to pregnancy. We have been married over 40 years, so pregnancy is not an issue. He sees his doctor next week and we will ask him about this, too. I was just wondering if anyone is will to share their knowledge or experience with this issue. Thank you in advance.
Stacey