Hello Francis,
We usually wait until at least release candidate, before starting to add the support.
The reason is that Microsoft often reserves the right to do breaking changes in the last moment and sometimes we had to start re-implementation of already implemented support.
Reading the changelog of SSMS 2018 I already see that they are moving in the right direction, but it also means for us some 2-4 weeks of work to add the support.
So: certainly we will be adding the support, but currently we wait until SSMS 18.x gets to final pre-release state.