Its one thing to sign a contract. And another to have actual delivery of the platform. And then another to achieve IOC. And then to finally have full operational capability.
It takes TIME! Forget about 2022. You're looking at much later. Especially if any Western origin new build fighters are the goal.
Myanmar Air Force's Yak-130 trainer/light attack aircraft with various weapons include R-73E short-range air-to-air missiles, S-13 122mm rocket on B-13 rocket pod, S-8 80mm rocket on B-8 rocket pod and SNPU-130 pod 23mm gun pod.
Bangladesh's defence budget is 1.2% of GDP, its the second lowest in the region after Bhutan.
https://www.sipri.org/sites/default/files/Data for all countries from 1988–2018 in constant (2017) USD (pdf).pdf
I don't expect the defence budget to rise abnormally becausee 60% of the budget is dedicated towards salaries of personnel and only a small armount goes towards defence purchases. Most of the purchases are made through special allocations not covered by the official defence budget.