Coursera, an online education platform that has seen its business grow amid the coronavirus pandemic, is planning to file paperwork tomorrow for its initial public offering, sources familiar with the matter say. The company has been talking to underwriters since last year, but tomorrow could mark its first legal step in the process to IPO. The Mountain View-based business, founded in 2012, was last valued at $2.4 billion in the private markets, during a Series F fundraising event in July 2020.