I'm confident VSL will add VST3 hosting eventually, but they have stated numerous times, they don't have a timeline for when.
There are very few plugins that only run as VST3. You should also be aware that the VST3 protocol has some inherent flaws which generally make it preferable to use the VST2 version of an instrument whenever you have the option to choose VST2 or VST3. This is particularly applicable to instruments plugins, which is the main point of using VePro.
If you have some particular plugin which is only available as VST3, there is also the possibility that you can use KushView Element, BlueCatAudio Patchworks or something similar inside VePro to host that one plugin..the rest of your plugins, its a better choice to use the VST2 version anyway.
I only mention this because VePro7 is a fantastic product and if you have a reason to use it, I would not let the VST3 issue hold you back. By the way there is no guarantee that even VePro8 will provide VST3 hosting, VSL has never promised anything for VST3 other then its on their long term radar. These other work arounds will get you going and in my opinion you are better off using the VST2 versions of all of your instrument plugins that support it in any case.
Steinberg is getting increasingly strict about VST3 compliance....in the future it may become more mandatory for VePro to support hosting VST3 plugins...but in my view today in 2022, its really only a few isolated cases where VST3 support is truly needed, and the rest of the time you are better off using VST2.