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Will the collation work properly using utf8mb4_0900_ai_ci? I found that this is what MySQL 8.0.30 switches to when importing data from the old server (MySQL 5.7).
utf8mb4_0900_ai_ci the default in MySQL 8? utf8mb4_0900_ai_ci even if it is not the default? 
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Yes, the default value in MySQL 8.0 is utf8mb4_0900_ai_ci. You can check the default system settings yourself by consulting the manual, for example: https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_collation_server
Yes, this is a good collation to use in MySQL 8.0. That's what I would choose. It includes the latest changes to the UTF standard available in MySQL.