According to this PR the divy will be paid by March 10th. Think the CVR will be issued at that time as well ( the CVR doesn't matter all that much since it's based on future accomplishments) . Here's the paragraph that lays it out :
In connection with the closing of the merger, a one-time special cash dividend of $75 million, or approximately $0.36 per share, will be paid no later than March 10, 2023 to Sesen Bio stockholders of record at the close of business on March 7, 2023. Under the terms of the merger, Sesen Bio stockholders also received one Contingent Value Right, which entitles the holder to receive a cash payment related to any potential proceeds from the sale of Sesen Bio's legacy assets, including Vicineum, and the potential $30 million milestone payment under the Roche Asset Purchase Agreement.