Pretty sure Oregon volcano snowpacks are doing great this year! Butttt who knows how the spring warmup will go and what the weather will be like for the days you're around? I wouldn't recommend buying plane tickets to do specific objectives up here in the spring, but if you are flexible and could pivot to still have fun if you can't do these specific peaks, then great!
I haven't been up Jefferson before and I love skiing and have technical snow and ice experience, so if the timing works out I could get stoked on it! Send me a message with your phone number and a few paragraphs about your climbing experience, specifically steep snow and ice!