If you want to recover OST file to PST file format. You can use OST to PST Converter for Mac
application this utility migrate offline storage table OST file to Outlook PST file format on Mac. This task actually is a big deal because professionals do not suggest a manual method to OST recovery, it is always advisable to use a third-party tool like OST to PST Converter for Mac which supports MS Outlook 2003, 2007, 2010, 2013, 2016 to 2019. This application supports all Mac OS versions.