You should not wait too long. There is a limited number of vaccines and the quantities expected in the future will probably be greatly reduced as India hordes them.
The AstraZeneca vaccines that are being administered come from the COVAX initiative that purchased them from the Serum Institute of India.
COVAX, which is critical for poorer countries, relies on AstraZeneca shots made by the Serum Institute of India, the world's biggest maker of vaccines. It was already around 100 million doses short of where it had planned to be when India halted exports a month ago amid a surge in infections there.