...In My Opinion...Based Only on the Sound; It Is NOT a Main Bearing, and NOT a Rod Bearing! The 'Tick' Could Be:
1. Exhaust LEAK
2. Loose Valve Adjustment/Failing Hydraulic Lifter
3. Fuel Pump EXCENTRIC
Was the Engine Running at Normal Hot Temperatrure? Lifters will Normally Make a Similar Noise (especially 'Solids'), Until fully warmed up And the oil Pressure is UP (Hydraulics).
Good Luck with It!
… Yes! It could be a Rod Bearing, Spun after sitting for years. Just starting to go and has found 'PLAY'. A 'Main' Bearing would sound like a Deep Rumble.