if I reserved two tickets for wonderspaces at 12:45 and I’m a lil late after that time do they still allow you to come in as long as you bought the tickets or it has to be at that exact time ?

You can show up up to 15 minutes after your time.

The grace period is short and with the CDC protocol that calls for timed entry it impacts the flow of the experience

I wouldnt recommend being late only because of there guidelines and I believe it states before purchasing tix about if you're late you won't be able to go in. Try calling them to see what they'd say ,guidelines change everyday you know.