Are there statistics somewhere that shows the number of blocks mined daily

As a general rule, any timing assumptions a contract makes about block numbers and timestamps should be considered generally reliable in the longer term (i.e., on the order of at least several hours) but unreliable in the shorter term (minutes). (It so happens these are generally the same assumptions one should operate under when using block numbers directly on Ethereum)

Note: L2 blocks are simply created when transactions are submitted, there is not set block cadence