Oh. Yellow and orange from your cross are very possible! But you can't count on it.
Also, if you are planning on selecting a true-breeding line that is yellow or orange, even if the F1 is not yellow or orange, you will find yellows and oranges in subsequent generations.
Sometimes we wait a day, and sometimes we do not. Cross pollination seems to work either way. I think the most important thing is to make sure you are emasculating the oldest flowers that are not at risk for having already shed pollen. As long as the petals are still pale, pollen shed is very unlikely, even if the petals have opened a bit.
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