Two questions on illegal pitch

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HS playoff game, ASA rules. R1 on 1B. As pitcher delivers, PU throws out left arm, but does not declare "Illegal pitch" until after ball is received, without swing. R1 does not attempt a steal. Two questions:

1. Should the PU verbalize "illegal pitch" right away? As a fairly new ump, all the FP I do is jr. high and JV, where we inform but don't call illegal pitches. I call it right away in SP, but they have time to hear it and react. But I can see where a PU that verbalizes as the ball is coming in could disrupt the batter in FP.

2. Should the umpires place R1 at 2B, or just allow it if she ambles down? The rules says "runners are entitled to advance one base without liability to be put out". In this case, R1 is still at 1B after the expected ten minute argument.