The plan now for 321search is to continue with PrimeGrid to n=5M. Thereafter PrimeGrid will take over. They are currently sieving to n=10M. I guess there are 2 or 3 more primes below that.
There is a chance we will find another megaprime below n=5M -- I am hoping for some bunching now in the sequence of 321 primes
With PrimeGrid's help we should be able to finish to n=5M within 6 months