Is the Army switching from the APFT to the ACFT?

It is in the implementation phase which started on 1 October, it becomes the official army test of record on 1 Oct 2020. All units are directed to take the test twice in 2019 for diagnostic assessments.

full dates and facts can be found here.
https://www.army.mil/acft/

I have seen the ACFT being administered by some units. My unit is still taking the APFT. What I read was that some units will be used for evaluation to see if the standards they published need to be changed. I found the timeline below online:

No Later Than October 2020
According to Lt. Col. Feltwell, Once the army completes the initial operational capability the Army Combat Readiness Test could be fully implemented and the official Army Physical test of record.

Winter 2019
FM 7-22 will be updated with the new ACFT and the training plans for prepairing for the test.

October 2019
Initial implementation: the entire Army will take two not-for-record ACFTs six months apart.

October 2019- Finalization
Once the field test is complete the ACFT standards are expected to be finalized.

If it’s possible, you should see if you can go to post nearby and sign up for it. Ft Sam Houston and BAMC units are testing it. All in all, it’s actually pretty fun but it’ll smoke you if you don’t have any cardiovascular fitness.