Amendment CPC-17.7 is intended to add clarity to that final consent given just prior to the administration of the lethal dose. It says currently, as the bill is written, “immediately before”. I think most people would understand what that means, but “immediately before” to some people could mean a week prior.
The change in wording to “at the time of” means that at the time the procedure is going to be administered, that person is given one final opportunity to say “no”. It's just changing the words from “immediately before” to “at the time of”.