The short answer
Agree regular meeting times, a project contact and a shared place for decisions and files. Clear written updates keep the work moving between calls.
In more detail
A useful progress update shows what changed, what was tested, what is next and which decisions need your input. The meeting rhythm and response arrangements can be set around both teams.
Requirements, drawings, component lists and engineering changes need version control. Keeping one agreed record helps prevent a late decision from being built into the wrong sample.