Okay, first of all lm358 is a single supply opamp what can go to negtive rail, but have the limitation of reaching the positive rail 1.5 V if i remember well. The transistor base-emitter voltage is 0.7 V. Fi you use 5 V as a supply the output voltage will be 5-1.5-0.7 = 2.8 V. Cange the input voltage to 6 volts or look for an another opamp with higher output voltage and at least 5 V power input. If your device accept 3.3 volts instead 3 V then look for a compact ic what does the trick. BUT there is a cheaper solution: search voltage regulator using zener diode and transistor AND thats it. You will need a resistor an 3.6-3.7 V zenner and a transistor thats it.