We have no plans to add new features to VP 19 from this point.
Is ProRes RAW support an official feature of Vegas Pro/Post 20? We need to know before even considering the limited time upgrade to 20 that expires in 2 days. I see the logo for it on the sales popup, but the official list of ProRes RAW products from Apple does not list any Magix products. It does, however list them under the entries for ProRes generally (aka "regular" ProRes, but NOT RAW, which is a separate list). Link below where you can view both lists.
You can upgrade to VP 20 after 20 is released as well. Even if ProRes raw is planned for 20, it may not be available on day one under the continuous delivery model where features are added as they are completed.
Btw, the current upgrade offer is apparently the same 2-for-1 deal (another vp19 + vp20) usually offered prior to release of the new version. In the past, once the new version got released, no more 2-for-1.