The minimum time for a domain name transfer is 5 business days. It is difficult to provide an exact time frame because the procedure depends on the time it takes the owner to confirm the transfer and the time your current registrar takes to accept or reject the transfer.
You should receive a notification in your email when the transfer completes along with all necessary information about the process.
If you are a SiteGround customer, you can check the current status of your domain transfer in your Customer’s area, My Account tab.