Exchange it as you need it - if you need it. It kinda works like Dollar Cost Averaging for investments. The different rates you'll get paid on the different amounts you exchange may average out to a better rate on the whole. Also, find out what the rate was for the past week and leave an order with your bank to exchange
your money immediately if it reaches: ex. 1.46 and you'll hold if it's lower than 1.45. The other thing is shop around for the best exchange rate. I exchanged some tonight at 1.4515 at my bank and they seem to always pay about .0115 & .020 higher than the main Chartered Banks.
Once the US decides when and if this war will take off - you may want to keep some USD to invest - after a war or depression is the best time to invest in stocks.
Just my
Trixxxia