Your questions about SoFi Hong Kong are answered here

Our cut-off time for withdrawal instructions: 11am on weekdays, Monday to Friday. We are not currently able to process fund withdrawals on weekends and public holidays.

If you submit your withdrawal request in-app by 11am, the amount will usually show up in your bank (HSBC/BOC HK) account after 8pm the same day. For non HSBC/BOC HK accounts, there may be up to 1 business day of processing time.