To add to the wealth of info already in this thread, my experience opening an IBKR account via TSG:
1) Completed account registration IBKR via TradeStation Global (11.50am 21/9 Monday)
2) Sent SGD 326.68 (MYR 1000) to IBKR via TransferWise (1.30pm)
3) IBKR account created (can login) but no trading data yet. (6.00pm 22/9 Tuesday)
4) Received email from TSG that account has been created and ready for funding. Transaction history still show money not received yet. (5am 23/9 Wednesday)
5) Account able to be logged in with trading data. Money not received yet (2pm)
6) Initiated transfer of SGD 1400 to IBKR from CIMB SG via FAST (2.11pm)
7) SGD 1400 received at IBKR. Prompted to register Trusted Contact Person upon first check of transaction. SGD 326.68 via TW still not available. (3pm)
I opened CIMB MY and SG account in parallel on Monday as well. All in all, done in a bit over 2 days.
Would not recommend TransferWise for initial funding direct into IBKR, even if non-USD. The early transfer of SGD into IBKR via TW instead of waiting for CIMB SG to be set up did not provide any time savings. Looks like I'm gonna need to engage TSG CS on that.
EDIT:
8) SGD 326.68 via TW was finally credited in, without my intervention. Guess needed the CIMB SG transfer to be the gate opener only TW can masuk. (10pm)
So for your step 6, CIMB SG you used transferwise to get the money there or you used CIMB's own internal transfer (and their exchange rate)?