No. Just buy tickets online the day before for the timeframe you want.
I was just there a few weeks ago and by purchasing your tickets online, you schedule a day and time. Although our visit was during the week, it wasn't crowded. There were probably 50 ppl in the entire museum. We purchased tickets online the morning of (9 am) and was able to visit at a scheduled time (12:45pm)... I'd recommend planning ahead and purchasing your tickets online.
Probably, but you can get right in if things stay as they are. A reservation doesn't hurt.
If current situation continues it would be advisable to do so. I would call ahead and confirm.
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