For a real life example, consider Quetzalcoatlus Northropi:
Though there's still some debate on the matter, they probably weighed closer to 200kg than 500kg. Some estimates were closer to 500kg but the author cast doubts on the ability of something that heavy to actually get off the ground.
The size probably isn't far off what you need. Compare with a Cessna 152 which has a similar size and weight.
the flight is like that of a bat, for example, able to fly up and down as well as glide and up to speeds of 180-200km/h
Bats, even the biggest ones, are what biologists might refer to as "not very big". Your half-tonne dragon, by comparison, might actually be bigger than any living thing that has ever flown unaided.
What it will do is to leap into the air, and flap for as little time as possible in order to transition to thermal-assisted soaring flight, because continuously muscle powered flight in something that enormous would require an impractical amount of stored energy.
It might be able to reach the lower end of the speed range you're thinking of, but it'll be tricky and would put quite a lot of stress on those big wings. It certainly won't be fluttering about, but you definitely wouldn't want to be on the wrong end of a fast descent by a predator that big that could probably see you from many, many miles away.
the wings are around the shape of these wyvern wings
Wyverns are fantastical, not realistic. If you want something wyvern-shaped to be flying around, then you should probably not think too hard about plausible biomechanics, because you'll be disappointed.
Be sparing with your details, and there's no danger of being unambiguously wrong. Not everything has to be hard scifi!