After check-in my return flight got cancelled, can I claim compensation?

The carrier has to offer you the option between the reimbursement of your ticket and a return flight to the airport of departure at the earliest opportunity or re-routing to your final destination at the earliest opportunity or re-routing at a later date at your convenience under comparable transport conditions, subject to the availability of seats. In case you are re-routed and you reach your final destination with a delay of 3 hours or more you are entitled to compensation.The carrier has to offer you the option between the reimbursement of your ticket and a return flight to the airport of departure at the earliest opportunity or re-routing to your final destination at the earliest opportunity or re-routing at a later date at your convenience under comparable transport conditions, subject to the availability of seats. In case you are re-routed and you reach your final destination with a delay of 3 hours or more you are entitled to compensation.The carrier has to offer you the option between the reimbursement of your ticket and a return flight to the airport of departure at the earliest opportunity or re-routing to your final destination at the earliest opportunity or re-routing at a later date at your convenience under comparable transport conditions, subject to the availability of seats. In case you are re-routed and you reach your final destination with a delay of 3 hours or more you are entitled to compensation.The carrier has to offer you the option between the reimbursement of your ticket and a return flight to the airport of departure at the earliest opportunity or re-routing to your final destination at the earliest opportunity or re-routing at a later date at your convenience under comparable transport conditions, subject to the availability of seats. In case you are re-routed and you reach your final destination with a delay of 3 hours or more you are entitled to compensation.