Amazing episode, very very good story in a very very good series! I cannot stress this enough!
"Second Contact" written by Mike McMahan tells us Boims was commissioned in 2379, and according to Mariner's dialogue Brad's worked with her and the Cerritos senior staff for a year. (Based on the Stardate 57436.2, some would say it's Jun 8, 2380.) In the same episode, when Boims introduces Rutherford to Tendi, Brad says of Sam: "and, as of a couple weeks ago, cybernetically enhanced!", Tendi eagerly declaring she's never met "a recent cyborg". Much of Rutherford's first date with Barnes and also "Envoys", the whole season, really, continues to indicate Sam's implant is new to him.
"Reflections" also written by Mike McMahan, (set on potentially May 10, 2381 by the Stardate 58354.2), tells us Rutherford transferred to the Cerritos on Stardate 56329.4 (some might say that was May 1, 2379). This correlates well with the probability (but not guarantee) that Samanthan has slept across the hall from Boimler and Mariner for a year before they all met Tendi. There is good reason to believe that if Rutherford got the implant "a couple weeks ago", Brad and Beckett were nearby to see it for the first time.
The memory in "Reflections" strongly indicates Rutherford got the implant after an explosion while he's dressed as a "first year", a personality which Dr. T'ana says is from "a decade ago". Help me square these details, subsequent stories!