I do most of my websites on my MacMini, with a large monitor, but I am due to go abroad for several weeks in the new year and will want to work from my 2015 MacBook. I remember seeing someone else pose the question on the old Forum (needless to say, I can’t find it now!), to be told that this wasn’t possible at the moment.
I don’t really understand why, as if the instances of Rapidweaver are the same, with the same plug-ins, stacks, etc. and the website data files are on Dropbox, or Copy, what would stop you doing this?
If it is something that you are actively working on, then January, or earlier would be a nice time to implement it.