UPDATE: On April 6, 2018, USCIS reached the congressionally-mandated 65,000 H-1B visa cap for fiscal year 2019. USCIS also received a sufficient number of H-1B petitions to meet the 20,000 visa U.S. advanced degree exemption, known as the master’s cap.
USCIS will continue to accept and process petitions that are otherwise exempt from the cap. Petitions filed for current H-1B workers who have been counted previously against the cap, and who still retain their cap number, will also not be counted toward the FY 2019 H-1B cap.
USCIS H-1B Cap page: https://www.uscis.gov/working-united-states/temporary-workers/h-1b-specialty-occupations-and-fashion-models/h-1b-fiscal-year-fy-2019-cap-season