It really does depend upon the situation.
Is the MBP yours? If it is and you have controlled what software was installed and how it is configured then you are probably safe. I'm new to OSX, but have been in Info Sec most of my career and I work for a company with over 30,000 employees. My experience is more from the Unix/Windows server and Windows client side, but I will say that most employers do set no expectation of privacy using company-owned assets. We have software installed on all client systems that monitor for certain types of data and user behavior (what web sites they access). Our group routinely scans employee computers (company owned) whenever managers report a potential issue. The process involves either capturing an image remotely and scanning the image or scanning the actual system. We also check internet activity routinely (we have systems that capture and log all outbound traffic and block access to most addresses that are not business-related). Yes, we have a huge amount of storage full of data. The last 90 days of activity gets stored on disk. Over 90 days goes to optical storage and then is stored in an offsite vault. The typical big oversight that I see most employees make is forgetting about their email. Our email is hosted on Exchange and all email can be reviewed at any time by management, legal, HR, Info Sec.
If you work for any company and signed an employment agreement, or use company-owned assets, do not expect any protection of your privacy when it comes to company-owned assets or when you are working. Some may think that I'm full of it, but believe that I am not - especially if you work in the government or finance business sectors.