I mean it is almost certain that the Sox have SOME more signings to announce. Typically they formally sign around half a dozen guys on signing day who are in the 200+k ish range. With the weird information flow and blatant rules violations that already happen down there, its hard to get information on signings ahead of time in a good year. When you factor in covid and some of the extra political problems happening in some of these countries, I can imagine information is at a premium right now.
The other side of the coin is, if they DON'T announce another chunk of signings in a month, it is a really good sign that they already have an in with someone like Prieto or another defector that hasn't been announced yet.