I can speak to over-the-horizon radar. It's OTHR Arctic, which is one of two Canadian radars that will be fielded by 2026. For the polar variant, which will be situated further north in Canada and will look over the poles, I don't have a date on that, but it's a number of years later. There is still a certain amount of R and D going on to figure out how to bounce off the polar atmosphere. The U.S. is in line with similar timelines, with 2026 for their radars for the coasts.
On April 29th, 2024. See this statement in context.