Biden's approach to the pandemic in a nutshell is to underpromise and overdeliver. Actuallt, its underpromise to a ludicrous degree. The same goes for Biden's target date of May 1 for making all folks over 18 eligible to be vaccinated. States were already moving quickly in that direction; all adults are eligible in Alaska right now and in Mississippi starting today.
Georgia, Michigan, Utah, and Connecticut to follow in early April. That will put tremendous pressure on other governors to follow suit quickly, not wanting to be seen as falling behind their neighbors. The May 1 deadline is another case of Biden setting the bar on the floor so that his team can easily step over it. Kinda like 100 million doses in first 100 days.