Firstly, my point was that if the seder would “formally” be over on time, as is best l’halacha, it would be practical to have a shalom zachor. You could happily continue afterwards til you fall asleep at the table.
Second – most delays are not in magid, but in getting ready, hearing 27 mah nishtana’s, giving out maror and korach portions, and afikoman negotiations (apply whichever of the above happens in your family).
Third, most cute vertlach that people say at magid has nothing to do with sipur yetzuas mitzrayim.