There are some income restrictions on the CA rebate that you need to read through to determine if you qualify. If your income is too high you may be limited to just the HOV sticker but not the rebate. You will also need to wait for your license plates to arrive for the HOV stickers although I don’t remember needing a license plate number for the CA rebate. I’m sure you are aware that CA ran out of funds so at this point it’s just a wait list to see if more funding is approved.
Check with your utility company as well to see if they have any rebates. We had a $450 rebate for buying a wall connector plus $1,000 rebate on the Model 3 itself.