Did your oncologist give you a reason why to wait with the vaccination?

the cleveland clinic posted about wait time before getting the vaccines for certain chemo treatments,
so get the advice from your oncologist-

"For patients receiving chemotherapy or other immune suppressing treatments: In general, receiving either vaccine during chemotherapy is recommended. But because the vaccines can cause a fever within the first 24 to 48 hours, it’s preferable to receive the vaccines at a time when your white blood counts are not expected to be low. This is because if a fever occurs when your blood counts are low, it may require hospitalization. In some circumstances, it may be appropriate to delay vaccination until after completion of very intensive chemotherapy treatments such as those given as induction therapy for acute leukemia."