Is it almost time to enjoy a mai tai by Revere Beach? Video shot this week showed progress being made on the new tiki bar the Kowloon is planning to open on Revere Beach. The sign to the beachside satellite location was placed above the doors Tuesday. There’s no date for a grand opening yet, but the owner told us last month that the Revere location should be open by May. The new restaurant — Kowloon Tiki on the Beach at Revere Beach — will combi…