Not really. Everything AFTER t=0 is covered... but t=0 (how, why, what banged) is not covered.
Don’t argue with me about it. Take it up with Alan Guth. He says it all the time.
>>but t=0 (how, why, what banged) is not covered.
At T=0 the universe popped into existence like a bubble from another universe.
https://duckduckgo.com/?q=Universe+is+a+bubble
But even though that model covers T=0 (for the universe the modelers live in), it still leaves the ultimate origin of E a mystery.