Sorry for the missinformation…
i was under the impression that the deferral was automatic…
this is the part about it…
(Q) Can I use my 2020 Boston Marathon qualifying time for the 2021 Boston Marathon?
(A) Yes. The B.A.A. is reviewing all specifics involved in the registration procedure for the 2021 Boston Marathon, and additional details related to both the qualifying window and registration dates for the 2021 Boston Marathon will be announced and posted in the coming weeks.