They are making progress with laser locking over kilometer distances.
They are making 2 gram starchip prototypes.
they are looking at making ultrathin starchips that would be a meter across but very lightweight.

Arxiv – A Roadmap to Interstellar Flight

Lubin's designs would enable wafersats to reach 25% of lightspeed and a 100 ton spaceship to reach 1000 kilometers per second.