No, these are not UFOs. Have you ever wondered what Elon Musk's Starlink satellites that fly at an altitude of 550 kilometers look like?, you can watch this video. The creator of the video claims that this is not a time-lapse but a real-time video. The two rows of satellites fly a little higher than each other. If you want to see when they will pass over where you are, you can visit the page https://james.darpinian.com/satellites/