Historically, yes but PHS said not committed.

Usually within the day if everything fit and proper.

I think no need, but it must be under your name.

I tried using standard chartered to bank in but my registered bank account is maybank.

That registered bank account is mainly for redemption purpose only.

In flow money as long as is your own personal bank, you can bank in from whichever bank you like.

Did you face any problem for payment using FPX?

I noticed that Opus page didn't acknowledged after payment completed with Boost.
The page is hanged at where you scan the QR code.

I have to wait till email from "FPX Requery Scheduler" to notify that the transaction status changed to "Accepted For Processing".