The search for gravitational wave (GW) signals during the first three observing runs of Advanced LIGO, Advanced Virgo and KAGRA has been very successful: 90 compact binary coalescences have been detected so far, including a binary neutron star merger also seen across the electromagnetic (EM) spectrum. These discoveries opened a new chapter in the study of the universe and demonstrated the huge informative power of GW and joint GW and EM (multi-messenger) observations. We are now approaching the beginning of the next observing run (O4), that will start on May 24, 2023 and is planned to last 20 months, and more GW (and possibly multi-messenger) detections are expected in the near future. This talk will give an overview of the GW observations so far, review the plans for O4 and present the prospects for GW and multi-messenger detections in the next couple of years.