Does the First-Step-Act apply to defendants on direct-appeal?

Questions Presented 1. Does the provision of the First Step Act, Pub. L. 115-391, 132 Stat. 5194 (Dec. 21, 2018), that amended 21 U.S.C. § 841(b)(1) to reduce mandatory-minimum sentences for drug-case defendants with certain qualifying prior convictions apply to defendants whose cases were on direct appeal at the time of its enactment? 2. Should the Court should hold this petition pending disposition of Greer v. United States, No. 19-8709—which will address whether courts may consider matters outside the trial record when deciding plain-error claims based on Rehaif v. United States, 139 S. Ct. 2191 (2019)— and then grant this petition, vacate the judgment, and remand for reconsideration in light of that decision (GVR)? ii