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the circuit will have delay of more than 10-12 seconds .
If that delay is tolerable then it is ok.
The current requirement of your controller is dependent on bc857.
Did you simulate your delay circuit ?
what is the voltage at pin 8(Vs+) after the delay ?
Leave the simulation part now.( it will consume more time to learn and debug if you are new to it.)
If at all , if you want to make it , first make breadboard version and test it before making a pcb.
This will save you lot of time and money.
No problem with old schematic or pcb software as long as it meets your needs.
one more , do you want to apply the supply voltage to the microcontroller delayed , or will it be good to apply the RESET signal delayed ?
Based on your final application you can select.
Still does it exist simulation software which could work on small schematics like this one?