Hybrid Exchange 2019 move to M365

Dear All,

I am asked to move/ migrate the existing Hybrid Exchange to M365.

All mailboxes are located in M365.

MX Record is pointing to the third-party spam filtering company which we are not too sure either stay with them or not.

My next concern is the Send and Receive connectors.

has any one of you done similar task like this? any help or document/ link would be much appreciated.

Regards