Since the Boost Mobile people don't care about answering us, here is the answer, from a Sprint News Release:
"Galaxy S10e Coming to Boost Mobile
Samsung Galaxy S10e can also be paired with no-contract plans from Boost Mobile giving consumers an additional way to save and find the best option to fit their needs. Galaxy S10e in prism white will be available for purchase beginning on March 8 in Boost Mobile stores and at www.boostmobile.com."
Still a non answer since last year when the S9 and S9+ came out you could purchase a Boost branded S9 or if you bought a Sprint S9+ or unlocked S9+ you could also use those on Boost.