Huawei: apps from Facebook still usable?

If I buy a Huawei cell phone, can apps like WhatsApp, Instagram and Facebook still be used? And if so, for a long time? How much longer, so what's going to happen?

Yes, all are still usable. I also don't think there will be a "lock" any time soon.

Only the very latest models (P30 Pro, for example) can't do this at the moment, or if so, only through detours / tricks.

Cell phones like Mate 20 (Pro) can do everything without restriction.

And for as long as you are, you'll need a new cell phone again.

All mobile phones from Huawei that were on the market before the license was withdrawn and can be used all Google services as before, and Google has just applied for an exceptional license for Huawei, but the P40 and P40 Lite will also come on the market without Google services

https://www.inside-digital.de/news/google-beantragt-ausnahmegenehmigung-fuer-weitere-zusammenarbeit-mit-huawei