How would you time COVID-19 vaccination with someone on R-CHOP chemotherapy?

It is really hard to time COVID vaccine while on chemo. Although ideal time would be as far away from chemo as possible (3-6 months) or 6 weeks before chemo starts, that is not practical in someone getting q 3 week R-CHOP. I would recommend giving it when available and if possible, time it on a different day than chemo. The benefit would be lower due to lower B-cell response but will not hurt the patient in any way.

https://www.hematology.org/covid-19/ash-astct-covid-19-and-vaccines