I don't understand 最早将于 in the following snippet:
风暴中的张一鸣：外界骂他软弱 员工赞他理性, 11 August 2020.
Clearly 最早 means "earliest", but I don't understand 将于 at all.
[My translation:] According to many people in the industry, a lawsuit is ByteDance founder Zhang Yiming's only choice. And media information states, under this shut-out, Tiktok launched the first counterattack: 最早将于 this Tuesday raised a federal lawsuit, challenging Trump's executive order, a USA-wide ban on the aforementioned video sharing service.
Question: What does 最早将于 mean in the above snippet?