We’ve started working on Vivecraft for 1.13. There is still no official release of MCP, but sp614x, who writes Optifine, has manually created the MCP update so we can all move forward.
There is also still no Forge for 1.13. So we are going ahead under the assumption the first releases of Vivecraft will not have Forge support, to be added later. Forge is undergoing a very, very extensive re-write so that may be a long time coming yet.
I’d like to get a working build of Vivecraft out for testing within in the next 2 weeks, so keep an eye on this space, or join the Discord for more timely updates.
Stay turned and sorry this is taking so long.