H1B Extension Approved 1 Day Before 240 Day Expiry


My H1B Extension was approved in USCIS website 1 day before my 240 day was to expire.

H1B expired: 10/27/2019
H1B Extension Applied on 09/30/2019
240 day End Date: 06/22/2020
H1B Extension Approved: 06/19/2020
H1B Extension Approved From 10/27/2019 to 03/31/2021

I received an email notification & USCIS website got updated with this status. Can I continue to work after June 22nd 2020 or do I need to wait for the original I797 Approval Notice to be received before I can resume work ?