Jackie_Mariani I that case please contact your sales representative to get an actual status on the order. The MAK will be provided in the VLSC, as you mentioned
ZoltN I am not a licensing specialist, but what I know for sure is that the MAK has a given number of activations, so you should be fine when you have a key with the according number of your machines. Please get in contact with your sales representative to get a offer that matches your environment.
Mietek_Rogala To accomplish proxy activation for machines without internet connection you will have to deploy VAMT, this is pretty straightforward, please see following link for documentation: https://docs.microsoft.com/en-us/windows/deployment/volume-activation/vamt-requirements
With slmgr you can accomplish the key rollout only.