So here’s how transfers work (which is pretty standard from HYSA).
Any transfer request received after 9:30 AM ET, is considered a next day transfer. Transfers are via ACH and have no fees associated with the transfer. ACH transfers are 1 to 3 days, excluding weekends, holidays, bank (Federal Reserve) holidays.
So, if I transfer $50,000 at 10:00 AM ET on a Monday, it will be delivered/received Wednesday at the earliest and Friday at the latest. Exact time of availability is subject to receiving financial institutions policies and regulations.
This information is all contained in Apple Deposit Account Agreement.
https://www.goldmansachs.com/terms-and-conditions/Deposits-Account-Agreement.pdf
Instant no fee transfers are available by using a verified Apple Cash account.