My advise is to stay away from SCB. Their conversion rate is always poor. They give very high rate for foreign transactions and very low for foreign remittance encashments. On top of that they have excessively high charges for everything.
I have moved to HBL and they offer much better rates. I only stayed with SCB because of their online services, but other banks have now caught on in online services so there is no point in staying with them. HBL charged me market rates for AliExpress transactions, used my debit card.