Fastest ever falcon 9 turnaround is 45 hours, even if they never beat this(They probably will by an order of magnitude but let's ignore that)
Then 15 x 8760/45 = 2920 launches a year. Across all launch sites, or just 1945 a year for Starbase LA. ~5 a day.
at 150 tonnes a launch that's 438,000 tonnes a year from all launch sites or 292,000 a year from Starbase LA.
All launch sites would lapse F9s current annual mass to orbit every 2 days, and this site alone would lapse f9s annual mass to orbit every 3 days.
Again, this is all assuming their cadence never beats f9(it almost certainly will by a lot)